diff --git a/.gitignore b/.gitignore
index 89e0d58..25e0630 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,4 +42,5 @@ next-env.d.ts
 *.db
 tmp
 public/datasets
-public/downloads
\ No newline at end of file
+public/downloads
+public/calibration
\ No newline at end of file
diff --git a/src/app/actions/calibration.ts b/src/app/actions/calibration.ts
new file mode 100644
index 0000000..0604a49
--- /dev/null
+++ b/src/app/actions/calibration.ts
@@ -0,0 +1,135 @@
+'use server';
+
+import db from '@/lib/db';
+import { experiment_calibration } from '@/lib/model/experiment_calibration';
+import { eq, and } from 'drizzle-orm';
+import { revalidatePath } from 'next/cache';
+import { requireAdmin } from '@/lib/auth';
+import { unlink } from 'fs/promises';
+import { join } from 'path';
+
+export async function getCalibrationEntries(experimentId: number) {
+  try {
+    const entries = await db
+      .select()
+      .from(experiment_calibration)
+      .where(eq(experiment_calibration.experimentId, experimentId));
+    
+    return { success: true, data: entries };
+  } catch (error) {
+    console.error('Error fetching calibration entries:', error);
+    throw new Error('Failed to fetch calibration entries');
+  }
+}
+
+export async function deleteCalibrationEntry(calibrationId: number, experimentId: number) {
+  const result = await requireAdmin();
+  if (!result.authenticated || !result.admin) {
+    throw new Error('Unauthorized');
+  }
+
+  try {
+    // Get the entry to find the file path
+    const entries = await db
+      .select()
+      .from(experiment_calibration)
+      .where(
+        and(
+          eq(experiment_calibration.id, calibrationId),
+          eq(experiment_calibration.experimentId, experimentId)
+        )
+      );
+
+    if (entries.length === 0) {
+      throw new Error('Calibration entry not found');
+    }
+
+    const filePath = entries[0].file;
+
+    // Delete from database
+    await db
+      .delete(experiment_calibration)
+      .where(eq(experiment_calibration.id, calibrationId));
+
+    // Delete the audio file
+    try {
+      const fullPath = join(process.cwd(), 'public', filePath);
+      await unlink(fullPath);
+    } catch (err) {
+      console.warn('Could not delete audio file:', err);
+      // Don't fail the operation if file deletion fails
+    }
+
+    revalidatePath(`/admin/experiments/${experimentId}`);
+    return { success: true };
+  } catch (error) {
+    console.error('Error deleting calibration entry:', error);
+    throw new Error('Failed to delete calibration entry');
+  }
+}
+
+export async function updateCalibrationOrder(experimentId: number, orderMap: Record<number, number>) {
+  const result = await requireAdmin();
+  if (!result.authenticated || !result.admin) {
+    throw new Error('Unauthorized');
+  }
+
+  try {
+    // Update all entries with new order values
+    const updates = Object.entries(orderMap).map(([calibrationId, newOrder]) =>
+      db
+        .update(experiment_calibration)
+        .set({ order: newOrder })
+        .where(
+          and(
+            eq(experiment_calibration.id, parseInt(calibrationId)),
+            eq(experiment_calibration.experimentId, experimentId)
+          )
+        )
+    );
+
+    await Promise.all(updates);
+    revalidatePath(`/admin/experiments/${experimentId}`);
+    return { success: true };
+  } catch (error) {
+    console.error('Error updating calibration order:', error);
+    throw new Error('Failed to update calibration order');
+  }
+}
+
+export async function deleteAllCalibrationEntries(experimentId: number) {
+  const result = await requireAdmin();
+  if (!result.authenticated || !result.admin) {
+    throw new Error('Unauthorized');
+  }
+
+  try {
+    // Get all entries to delete files
+    const entries = await db
+      .select()
+      .from(experiment_calibration)
+      .where(eq(experiment_calibration.experimentId, experimentId));
+
+    // Delete audio files
+    for (const entry of entries) {
+      try {
+        const fullPath = join(process.cwd(), 'public', entry.file);
+        await unlink(fullPath);
+      } catch (err) {
+        console.warn('Could not delete audio file:', err);
+        // Don't fail the operation if file deletion fails
+      }
+    }
+
+    // Delete all entries from database
+    await db
+      .delete(experiment_calibration)
+      .where(eq(experiment_calibration.experimentId, experimentId));
+
+    revalidatePath(`/admin/experiments/${experimentId}`);
+    return { success: true, deletedCount: entries.length };
+  } catch (error) {
+    console.error('Error deleting all calibration entries:', error);
+    throw new Error('Failed to delete all calibration entries');
+  }
+}
diff --git a/src/app/actions/upload.ts b/src/app/actions/upload.ts
index 47d5003..48676f4 100644
--- a/src/app/actions/upload.ts
+++ b/src/app/actions/upload.ts
@@ -2,6 +2,7 @@
 
 import db from '@/lib/db';
 import { dataset_entry } from '@/lib/model/dataset_entry';
+import { experiment_calibration } from '@/lib/model/experiment_calibration';
 import { parseCSVLine } from '@/lib/csv-parser';
 import { revalidatePath } from 'next/cache';
 import { eq } from 'drizzle-orm';
@@ -302,3 +303,122 @@ export async function updateDatasetEntriesMetadata(
     }
   }
 }
+
+/**
+ * Process calibration audio files for an experiment
+ * Expects metadata.csv with columns: id, audio_file, dialect, order
+ * Audio files should be in a 'wavs' subfolder
+ */
+export async function processCalibrationEntries(
+  experimentId: number,
+  tempDir: string
+) {
+  try {
+    const result = await requireAdmin();
+    if (!result.authenticated || !result.admin) {
+      return {
+        success: false,
+        error: 'Unauthorized',
+        entriesCreated: 0,
+      };
+    }
+
+    const calibrationDir = join(process.cwd(), 'public', 'calibration', experimentId.toString());
+
+    // Validate temp directory exists
+    if (!existsSync(tempDir)) {
+      return {
+        success: false,
+        error: 'Temporary extraction directory not found',
+        entriesCreated: 0,
+      };
+    }
+
+    // Parse metadata from directory
+    const { rows } = await parseMetadataFromDirectory(tempDir);
+
+    const entries: typeof experiment_calibration.$inferInsert[] = [];
+
+    // Create calibration directory
+    await mkdir(calibrationDir, { recursive: true });
+
+    // Process each row
+    for (let lineIndex = 0; lineIndex < rows.length; lineIndex++) {
+      const row = rows[lineIndex];
+      const audioFile = row.audio_file as string;
+      // Audio files are in wavs subfolder
+      const audioPath = join(tempDir, audioFile);
+
+      if (existsSync(audioPath)) {
+        // Copy audio file to calibration directory, preserving filename from audio_file
+        const audioBuffer = await readFile(audioPath);
+        const filename = audioFile.split('/').pop() || audioFile;
+        const destPath = join(calibrationDir, filename);
+
+        await writeFile(destPath, audioBuffer);
+
+        entries.push({
+          experimentId,
+          dialectLabel: row.dialect,
+          order: lineIndex + 1,
+          file: `/calibration/${experimentId}/${filename}`,
+        });
+      }
+    }
+
+    if (entries.length === 0) {
+      return {
+        success: false,
+        error: 'No valid audio files found in wavs folder',
+        entriesCreated: 0,
+      };
+    }
+
+    // Check for existing calibration entries to avoid duplicates
+    const existingEntries = await db
+      .select({ file: experiment_calibration.file })
+      .from(experiment_calibration)
+      .where(eq(experiment_calibration.experimentId, experimentId));
+
+    const existingFiles = new Set(existingEntries.map(e => e.file));
+
+    // Filter out duplicates
+    const newEntries = entries.filter(entry => !existingFiles.has(entry.file));
+
+    if (newEntries.length === 0) {
+      return {
+        success: false,
+        error: 'All calibration entries already exist for this experiment',
+        entriesCreated: 0,
+      };
+    }
+
+    // Insert new entries into database
+    await db.insert(experiment_calibration).values(newEntries);
+
+    revalidatePath(`/admin/experiments/${experimentId}`);
+
+    return {
+      success: true,
+      entriesCreated: newEntries.length,
+      message: `Successfully processed and inserted ${newEntries.length} calibration entries.`,
+    };
+  } catch (error) {
+    console.error('Error processing calibration entries:', error);
+    const errorMessage = error instanceof Error ? error.message : 'Failed to process calibration entries';
+    return {
+      success: false,
+      error: errorMessage,
+      entriesCreated: 0,
+    };
+  } finally {
+    // Clean up temp directory
+    try {
+      if (existsSync(tempDir)) {
+        await rm(tempDir, { recursive: true, force: true });
+      }
+    } catch (cleanupError) {
+      console.error('Error cleaning up temp directory:', cleanupError);
+    }
+  }
+}
diff --git a/src/app/admin/experiments/[id]/page.tsx b/src/app/admin/experiments/[id]/page.tsx
index 3f8e294..b3f8304 100644
--- a/src/app/admin/experiments/[id]/page.tsx
+++ b/src/app/admin/experiments/[id]/page.tsx
@@ -4,6 +4,8 @@ import { experiment } from '@/lib/model/experiment';
 import { eq } from 'drizzle-orm';
 import EditableExperimentHeader from '@/components/EditableExperimentHeader';
 import DeleteExperimentButton from '@/components/DeleteExperimentButton';
+import UploadCalibrationModal from '@/components/UploadCalibrationModal';
+import CalibrationListModal from '@/components/CalibrationListModal';
 import { requireAdmin } from '@/lib/auth';
 import { redirect } from 'next/navigation';
 
@@ -66,6 +68,8 @@ export default async function ExperimentPage({ params }: ExperimentPageProps) {
 
         <div className="flex gap-3 mb-6">
           <DeleteExperimentButton experimentId={experimentId} experimentName={exp.name} />
+          <UploadCalibrationModal experimentId={experimentId} />
+          <CalibrationListModal experimentId={experimentId} />
         </div>
 
         <div className="bg-white rounded-lg shadow p-6">
diff --git a/src/app/api/upload-calibration/route.ts b/src/app/api/upload-calibration/route.ts
new file mode 100644
index 0000000..5816f6a
--- /dev/null
+++ b/src/app/api/upload-calibration/route.ts
@@ -0,0 +1,156 @@
+import { writeFile, mkdir, readFile, rm } from 'fs/promises';
+import { join } from 'path';
+import { existsSync } from 'fs';
+import extract from 'extract-zip';
+import { NextRequest, NextResponse } from 'next/server';
+import { requireAdmin } from '@/lib/auth';
+
+function parseCSVLine(line: string): string[] {
+  const values: string[] = [];
+  let current = '';
+  let inQuotes = false;
+
+  for (let i = 0; i < line.length; i++) {
+    const char = line[i];
+    const nextChar = line[i + 1];
+
+    if (char === '"') {
+      if (inQuotes && nextChar === '"') {
+        current += '"';
+        i++;
+      } else {
+        inQuotes = !inQuotes;
+      }
+    } else if (char === ',' && !inQuotes) {
+      values.push(current.trim());
+      current = '';
+    } else {
+      current += char;
+    }
+  }
+
+  values.push(current.trim());
+  return values;
+}
+
+export async function POST(request: NextRequest) {
+  try {
+    const result = await requireAdmin();
+    if (!result.authenticated || !result.admin) {
+      return NextResponse.json(
+        { error: 'Unauthorized' },
+        { status: 401 }
+      );
+    }
+
+    const formData = await request.formData();
+    const file = formData.get('file') as File;
+    const experimentId = formData.get('experimentId') as string;
+
+    if (!file) {
+      return NextResponse.json(
+        { error: 'No file provided' },
+        { status: 400 }
+      );
+    }
+
+    if (!file.name.endsWith('.zip')) {
+      return NextResponse.json(
+        { error: 'File must be a ZIP archive' },
+        { status: 400 }
+      );
+    }
+
+    if (!experimentId) {
+      return NextResponse.json(
+        { error: 'Experiment ID is required' },
+        { status: 400 }
+      );
+    }
+
+    const tempDir = join(process.cwd(), 'tmp', `calibration-upload-${Date.now()}`);
+
+    try {
+      // Create temp directory
+      await mkdir(tempDir, { recursive: true });
+
+      // Save uploaded file to temp location
+      const tempZipPath = join(tempDir, file.name);
+      const arrayBuffer = await file.arrayBuffer();
+      const buffer = Buffer.from(arrayBuffer);
+      await writeFile(tempZipPath, buffer);
+
+      // Extract ZIP file
+      await extract(tempZipPath, { dir: tempDir });
+
+      // Read and validate metadata.csv
+      const metadataPath = join(tempDir, 'metadata.csv');
+      if (!existsSync(metadataPath)) {
+        throw new Error('metadata.csv not found in ZIP');
+      }
+
+      const metadataContent = await readFile(metadataPath, 'utf-8');
+      const lines = metadataContent.split('\n').filter(line => line.trim());
+
+      if (lines.length < 2) {
+        throw new Error('metadata.csv is empty or invalid');
+      }
+
+      // Parse CSV header
+      const headers = lines[0].split(',').map(h => h.trim());
+
+      // Validate required columns
+      const requiredColumns = ['audio_file', 'dialect'];
+      for (const col of requiredColumns) {
+        if (!headers.includes(col)) {
+          throw new Error(`Missing required column: ${col}`);
+        }
+      }
+
+      // Validate that wavs folder exists
+      const wavsDir = join(tempDir, 'wavs');
+      if (!existsSync(wavsDir)) {
+        throw new Error('wavs directory not found in ZIP');
+      }
+
+      // Parse and count rows
+      let validRowCount = 0;
+      for (let i = 1; i < lines.length; i++) {
+        const values = parseCSVLine(lines[i]);
+        if (values.length === headers.length) {
+          validRowCount++;
+        }
+      }
+
+      if (validRowCount === 0) {
+        throw new Error('No valid entries found in metadata.csv');
+      }
+
+      return NextResponse.json({
+        success: true,
+        tempDir,
+        metadataCount: validRowCount,
+        message: `Successfully extracted ${validRowCount} calibration entries. Ready for processing.`,
+      });
+    } catch (error) {
+      // Clean up on error
+      try {
+        if (existsSync(tempDir)) {
+          await rm(tempDir, { recursive: true, force: true });
+        }
+      } catch (cleanupError) {
+        console.error('Error cleaning up temp directory:', cleanupError);
+      }
+
+      throw error;
+    }
+  } catch (error) {
+    console.error('Error uploading calibration ZIP:', error);
+    const errorMsg =
+      error instanceof Error ? error.message : 'Failed to upload calibration ZIP';
+    return NextResponse.json(
+      { error: errorMsg },
+      { status: 500 }
+    );
+  }
+}
diff --git a/src/components/CalibrationListModal.tsx b/src/components/CalibrationListModal.tsx
new file mode 100644
index 0000000..c3c3f83
--- /dev/null
+++ b/src/components/CalibrationListModal.tsx
@@ -0,0 +1,316 @@
+'use client';
+
+import { useEffect, useState, useRef } from 'react';
+import { getCalibrationEntries, deleteCalibrationEntry, updateCalibrationOrder, deleteAllCalibrationEntries } from '@/app/actions/calibration';
+import Modal from '@/components/Modal';
+import { ExperimentCalibration } from '@/lib/model/experiment_calibration';
+import { useAudio } from './AudioProvider';
+
+interface CalibrationListModalProps {
+  experimentId: number;
+}
+
+export default function CalibrationListModal({ experimentId }: CalibrationListModalProps) {
+  const [isOpen, setIsOpen] = useState(false);
+  const [calibrationItems, setCalibrationItems] = useState<ExperimentCalibration[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [draggedItem, setDraggedItem] = useState<number | null>(null);
+  const { currentAudioId, setCurrentAudio } = useAudio();
+  const audioRef = useRef<HTMLAudioElement>(null);
+
+  useEffect(() => {
+    if (isOpen) {
+      loadCalibrationItems();
+    }
+  }, [isOpen]);
+
+  async function loadCalibrationItems() {
+    setLoading(true);
+    setError(null);
+    try {
+      const result = await getCalibrationEntries(experimentId);
+      if (result.success) {
+        const sorted = [...result.data].sort((a, b) => a.order - b.order);
+        setCalibrationItems(sorted);
+      }
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to load calibration items');
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  async function handleDelete(calibrationId: number) {
+    if (!confirm('Are you sure you want to delete this calibration item?')) {
+      return;
+    }
+
+    try {
+      await deleteCalibrationEntry(calibrationId, experimentId);
+      setCalibrationItems(items => items.filter(item => item.id !== calibrationId));
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to delete item');
+    }
+  }
+
+  async function handleDeleteAll() {
+    if (!confirm('Are you sure you want to delete ALL calibration items? This cannot be undone.')) {
+      return;
+    }
+
+    try {
+      await deleteAllCalibrationEntries(experimentId);
+      setCalibrationItems([]);
+      if (audioRef.current) {
+        audioRef.current.pause();
+        audioRef.current.currentTime = 0;
+      }
+      setCurrentAudio(null);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to delete all items');
+    }
+  }
+
+  async function handleMoveUp(index: number) {
+    if (index === 0) return;
+
+    const reorderedItems = [...calibrationItems];
+    const temp = reorderedItems[index];
+    reorderedItems[index] = reorderedItems[index - 1];
+    reorderedItems[index - 1] = temp;
+    setCalibrationItems(reorderedItems);
+
+    // Prepare order map
+    const orderMap: Record<number, number> = {};
+    reorderedItems.forEach((item, idx) => {
+      orderMap[item.id] = idx;
+    });
+
+    try {
+      await updateCalibrationOrder(experimentId, orderMap);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to update order');
+      // Revert on error
+      await loadCalibrationItems();
+    }
+  }
+
+  async function handleMoveDown(index: number) {
+    if (index === calibrationItems.length - 1) return;
+
+    const reorderedItems = [...calibrationItems];
+    const temp = reorderedItems[index];
+    reorderedItems[index] = reorderedItems[index + 1];
+    reorderedItems[index + 1] = temp;
+    setCalibrationItems(reorderedItems);
+
+    // Prepare order map
+    const orderMap: Record<number, number> = {};
+    reorderedItems.forEach((item, idx) => {
+      orderMap[item.id] = idx;
+    });
+
+    try {
+      await updateCalibrationOrder(experimentId, orderMap);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to update order');
+      // Revert on error
+      await loadCalibrationItems();
+    }
+  }
+
+  function handlePlayAudio(calibrationId: number, filePath: string) {
+    const audioId = `calibration-${calibrationId}`;
+
+    if (currentAudioId === audioId && audioRef.current && !audioRef.current.paused) {
+      // Stop playing
+      audioRef.current.pause();
+      audioRef.current.currentTime = 0;
+      setCurrentAudio(null);
+      return;
+    }
+
+    // Stop any currently playing audio
+    if (audioRef.current) {
+      audioRef.current.pause();
+      audioRef.current.currentTime = 0;
+    }
+
+    // Play new audio
+    if (audioRef.current) {
+      const fullPath = `/public${filePath}`;
+      audioRef.current.src = fullPath;
+      setCurrentAudio(audioId);
+      audioRef.current.play().catch(err => console.error('Failed to play audio:', err));
+    }
+  }
+
+  function handleDragStart(index: number) {
+    setDraggedItem(index);
+  }
+
+  function handleDragOver(e: React.DragEvent, index: number) {
+    e.preventDefault();
+    if (draggedItem === null || draggedItem === index) return;
+
+    const reorderedItems = [...calibrationItems];
+    const draggedItemContent = reorderedItems[draggedItem];
+    reorderedItems.splice(draggedItem, 1);
+    reorderedItems.splice(index, 0, draggedItemContent);
+    setCalibrationItems(reorderedItems);
+    setDraggedItem(index);
+  }
+
+  async function handleDragEnd() {
+    setDraggedItem(null);
+
+    // Update order in database
+    const orderMap: Record<number, number> = {};
+    calibrationItems.forEach((item, idx) => {
+      orderMap[item.id] = idx;
+    });
+
+    try {
+      await updateCalibrationOrder(experimentId, orderMap);
+    } catch (err) {
+      setError(err instanceof Error ? err.message : 'Failed to update order');
+      // Revert on error
+      await loadCalibrationItems();
+    }
+  }
+
+  return (
+    <>
+      <button
+        onClick={() => setIsOpen(true)}
+        className="mb-6 px-4 py-2 bg-blue-500 text-white rounded-md hover:bg-blue-600 transition-colors"
+      >
+        📋 View Calibration List
+      </button>
+
+      <Modal
+        isOpen={isOpen}
+        onClose={() => {
+          if (audioRef.current) {
+            audioRef.current.pause();
+            audioRef.current.currentTime = 0;
+          }
+          setCurrentAudio(null);
+          setIsOpen(false);
+        }}
+        title="Calibration Items"
+        actions={[
+          {
+            label: 'Close',
+            onClick: () => setIsOpen(false),
+            variant: 'secondary',
+          },
+        ]}
+      >
+        <audio
+          ref={audioRef}
+          onEnded={() => setCurrentAudio(null)}
+        />
+        <div className="space-y-4">
+          {error && (
+            <div className="bg-red-50 border border-red-200 rounded p-3 text-sm text-red-700">
+              {error}
+            </div>
+          )}
+
+          {loading ? (
+            <div className="text-center text-gray-500">Loading...</div>
+          ) : calibrationItems.length === 0 ? (
+            <div className="text-center text-gray-500">No calibration items found</div>
+          ) : (
+            <div className="space-y-2 max-h-96 overflow-y-auto">
+              {calibrationItems.map((item, index) => (
+                <div
+                  key={item.id}
+                  draggable
+                  onDragStart={() => handleDragStart(index)}
+                  onDragOver={(e) => handleDragOver(e, index)}
+                  onDragEnd={handleDragEnd}
+                  className={`flex items-center gap-3 p-3 border rounded-lg transition-colors cursor-move ${
+                    draggedItem === index
+                      ? 'bg-gray-100 border-gray-400 opacity-50'
+                      : 'bg-white border-gray-200 hover:bg-gray-50'
+                  }`}
+                >
+                  <div className="flex-1 min-w-0">
+                    <div className="text-sm font-medium text-gray-900">{item.dialectLabel}</div>
+                    <div className="text-xs text-gray-500 truncate">{item.file}</div>
+                  </div>
+
+                  <button
+                    onClick={() => handlePlayAudio(item.id, item.file)}
+                    className={`inline-flex items-center justify-center w-8 h-8 rounded-full transition-colors flex-shrink-0 ${
+                      currentAudioId === `calibration-${item.id}`
+                        ? 'bg-red-500 hover:bg-red-600 text-white'
+                        : 'bg-blue-500 hover:bg-blue-600 text-white'
+                    }`}
+                    title={currentAudioId === `calibration-${item.id}` ? 'Stop' : 'Play'}
+                  >
+                    {currentAudioId === `calibration-${item.id}` ? (
+                      <svg className="w-4 h-4" fill="currentColor" viewBox="0 0 20 20">
+                        <rect x="6" y="4" width="2" height="12" />
+                        <rect x="12" y="4" width="2" height="12" />
+                      </svg>
+                    ) : (
+                      <svg className="w-4 h-4" fill="currentColor" viewBox="0 0 20 20">
+                        <path d="M6.3 2.841A1.5 1.5 0 004 4.11v11.78a1.5 1.5 0 002.3 1.269l9.344-5.89a1.5 1.5 0 000-2.538L6.3 2.84z" />
+                      </svg>
+                    )}
+                  </button>
+
+                  <div className="flex items-center gap-1 flex-shrink-0">
+                    <button
+                      onClick={() => handleMoveUp(index)}
+                      disabled={index === 0}
+                      className="inline-flex items-center justify-center w-6 h-6 rounded bg-gray-200 hover:bg-gray-300 text-gray-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
+                      title="Move up"
+                    >
+                      ↑
+                    </button>
+                    <button
+                      onClick={() => handleMoveDown(index)}
+                      disabled={index === calibrationItems.length - 1}
+                      className="inline-flex items-center justify-center w-6 h-6 rounded bg-gray-200 hover:bg-gray-300 text-gray-700 disabled:opacity-50 disabled:cursor-not-allowed transition-colors"
+                      title="Move down"
+                    >
+                      ↓
+                    </button>
+                  </div>
+
+                  <button
+                    onClick={() => handleDelete(item.id)}
+                    className="inline-flex items-center justify-center w-8 h-8 rounded text-red-600 hover:bg-red-50 transition-colors flex-shrink-0"
+                    title="Delete"
+                  >
+                    ✕
+                  </button>
+                </div>
+              ))}
+            </div>
+          )}
+
+          {calibrationItems.length > 0 && (
+            <div className="text-xs text-gray-500 mt-4 p-2 bg-gray-50 rounded">
+              💡 Drag items to reorder, or use the arrow buttons. Click the play button to preview audio.
+            </div>
+          )}
+
+          {calibrationItems.length > 0 && (
+            <button
+              onClick={handleDeleteAll}
+              className="w-full mt-4 px-4 py-2 bg-red-500 text-white rounded-md hover:bg-red-600 transition-colors text-sm font-medium"
+            >
+              🗑️ Delete All Items
+            </button>
+          )}
+        </div>
+      </Modal>
+    </>
+  );
+}
diff --git a/src/components/UploadCalibrationModal.tsx b/src/components/UploadCalibrationModal.tsx
new file mode 100644
index 0000000..7c1aa0e
--- /dev/null
+++ b/src/components/UploadCalibrationModal.tsx
@@ -0,0 +1,368 @@
+'use client';
+
+import { useState } from 'react';
+import { processCalibrationEntries } from '@/app/actions/upload';
+import Modal from '@/components/Modal';
+
+interface UploadCalibrationModalProps {
+  experimentId: number;
+}
+
+export default function UploadCalibrationModal({
+  experimentId,
+}: UploadCalibrationModalProps) {
+  const [isOpen, setIsOpen] = useState(false);
+  const [files, setFiles] = useState<File[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [error, setError] = useState<string | null>(null);
+  const [success, setSuccess] = useState(false);
+  const [uploadQueue, setUploadQueue] = useState<Array<{ file: File; status: 'pending' | 'uploading' | 'completed' | 'failed'; message?: string; progress: number }>>([]);
+  const [status, setStatus] = useState<string>('');
+
+  function handleFileChange(e: React.ChangeEvent<HTMLInputElement>) {
+    const selectedFiles = e.target.files ? Array.from(e.target.files) : [];
+    if (selectedFiles.length > 0) {
+      setFiles(selectedFiles);
+      setError(null);
+      // Initialize queue with pending status and 0 progress
+      setUploadQueue(selectedFiles.map(file => ({ file, status: 'pending', progress: 0 })));
+    }
+  }
+
+  async function handleSubmit(e: React.FormEvent) {
+    e.preventDefault();
+    setError(null);
+    setSuccess(false);
+
+    if (files.length === 0) {
+      setError('Please select at least one ZIP file');
+      return;
+    }
+
+    setLoading(true);
+    
+    try {
+      // Process each file in the queue sequentially
+      const newQueue = [...uploadQueue];
+      
+      for (let i = 0; i < newQueue.length; i++) {
+        const item = newQueue[i];
+        item.status = 'uploading';
+        item.progress = 0;
+        setUploadQueue([...newQueue]);
+        setStatus(`Processing file ${i + 1} of ${newQueue.length}: ${item.file.name}`);
+
+        try {
+          // Upload with progress tracking
+          const uploadResult = await uploadFileWithProgress(item.file, i, newQueue);
+
+          // Process the extracted data
+          const processResult = await processCalibrationEntries(experimentId, uploadResult.tempDir);
+
+          if (!processResult.success) {
+            item.status = 'failed';
+            item.progress = 0;
+            item.message = `✗ ${processResult.error || 'Processing failed'}`;
+          } else {
+            item.status = 'completed';
+            item.progress = 100;
+            item.message = `✓ Processed (${processResult.entriesCreated} entries)`;
+          }
+        } catch (err) {
+          item.status = 'failed';
+          item.progress = 0;
+          item.message = `✗ ${err instanceof Error ? err.message : 'Network error'}`;
+        }
+
+        setUploadQueue([...newQueue]);
+      }
+
+      const failedCount = newQueue.filter(item => item.status === 'failed').length;
+      const completedCount = newQueue.filter(item => item.status === 'completed').length;
+
+      if (failedCount === 0) {
+        setSuccess(true);
+        setStatus(`All files processed! (${completedCount}/${newQueue.length} completed)`);
+      } else if (completedCount > 0) {
+        setStatus(`Completed with errors: ${completedCount} succeeded, ${failedCount} failed`);
+      } else {
+        setError(`All files failed to process`);
+      }
+
+      setFiles([]);
+
+      if (failedCount === 0) {
+        setTimeout(() => {
+          setSuccess(false);
+          setIsOpen(false);
+          setStatus('');
+          setUploadQueue([]);
+          window.location.reload();
+        }, 2500);
+      }
+    } catch (err) {
+      const errorMsg = err instanceof Error ? err.message : 'Failed to process uploads';
+      setError(errorMsg);
+      setStatus('');
+    } finally {
+      setLoading(false);
+    }
+  }
+
+  function uploadFileWithProgress(
+    file: File,
+    index: number,
+    queue: Array<{ file: File; status: 'pending' | 'uploading' | 'completed' | 'failed'; progress: number; message?: string }>
+  ): Promise<{ tempDir: string }> {
+    const MAX_RETRIES = 3;
+
+    return (async () => {
+      let lastError: Error | null = null;
+
+      for (let attempt = 1; attempt <= MAX_RETRIES; attempt++) {
+        try {
+          const result = await uploadAttempt(file, index, queue, attempt, MAX_RETRIES);
+          return result;
+        } catch (error) {
+          lastError = error instanceof Error ? error : new Error('Unknown error');
+
+          if (attempt < MAX_RETRIES) {
+            // Exponential backoff: 1s, 2s, 4s
+            const delay = Math.pow(2, attempt - 1) * 1000;
+            queue[index].message = `Retrying in ${delay / 1000}s... (attempt ${attempt}/${MAX_RETRIES})`;
+            setUploadQueue([...queue]);
+
+            await new Promise(resolve => setTimeout(resolve, delay));
+            queue[index].progress = 0; // Reset progress for next attempt
+            setUploadQueue([...queue]);
+          }
+        }
+      }
+
+      throw lastError || new Error('Upload failed after all retries');
+    })();
+  }
+
+  function uploadAttempt(
+    file: File,
+    index: number,
+    queue: Array<{ file: File; status: 'pending' | 'uploading' | 'completed' | 'failed'; progress: number; message?: string }>,
+    attempt: number,
+    maxRetries: number
+  ): Promise<{ tempDir: string }> {
+    return new Promise((resolve, reject) => {
+      const formData = new FormData();
+      formData.append('file', file);
+      formData.append('experimentId', experimentId.toString());
+
+      const xhr = new XMLHttpRequest();
+
+      // Track upload progress
+      xhr.upload.addEventListener('progress', (event) => {
+        if (event.lengthComputable) {
+          const progress = Math.round((event.loaded / event.total) * 100);
+          queue[index].progress = progress;
+          if (attempt > 1) {
+            queue[index].message = `Uploading (retry ${attempt}/${maxRetries})`;
+          }
+          setUploadQueue([...queue]);
+        }
+      });
+
+      xhr.addEventListener('load', () => {
+        if (xhr.status === 200) {
+          try {
+            const result = JSON.parse(xhr.responseText);
+            if (result.success) {
+              resolve(result);
+            } else {
+              reject(new Error(result.error || 'Upload failed'));
+            }
+          } catch (error) {
+            reject(new Error('Failed to parse response'));
+          }
+        } else {
+          try {
+            const error = JSON.parse(xhr.responseText);
+            reject(new Error(error.error || `Upload failed with status ${xhr.status}`));
+          } catch {
+            reject(new Error(`Upload failed with status ${xhr.status}`));
+          }
+        }
+      });
+
+      xhr.addEventListener('error', () => {
+        reject(new Error('Network error'));
+      });
+
+      xhr.addEventListener('abort', () => {
+        reject(new Error('Upload aborted'));
+      });
+
+      xhr.open('POST', '/api/upload-calibration');
+      xhr.send(formData);
+    });
+  }
+
+  function handleClose() {
+    if (!loading) {
+      setIsOpen(false);
+      setFiles([]);
+      setError(null);
+      setSuccess(false);
+      setStatus('');
+      setUploadQueue([]);
+    }
+  }
+
+  return (
+    <>
+      <button
+        onClick={() => setIsOpen(true)}
+        className="mb-6 px-4 py-2 bg-purple-500 text-white rounded-md hover:bg-purple-600 transition-colors"
+      >
+        + Upload Calibration
+      </button>
+
+      <Modal
+        isOpen={isOpen}
+        onClose={handleClose}
+        title="Upload Calibration Audio"
+        actions={[
+          {
+            label: 'Cancel',
+            onClick: handleClose,
+            variant: 'secondary',
+            disabled: loading,
+          },
+          {
+            label: loading ? `Processing ${uploadQueue.filter(f => f.status !== 'pending').length}/${uploadQueue.length}...` : 'Upload',
+            onClick: () => {
+              const form = document.getElementById(
+                'uploadCalibrationForm'
+              ) as HTMLFormElement;
+              form?.dispatchEvent(new Event('submit', { bubbles: true }));
+            },
+            variant: 'primary',
+            disabled: loading || files.length === 0,
+          },
+        ]}
+      >
+        <form id="uploadCalibrationForm" onSubmit={handleSubmit} className="space-y-4">
+          <div>
+            <label htmlFor="file" className="block text-sm font-medium mb-2">
+              ZIP Files (Multiple)
+            </label>
+            <div className="border-2 border-dashed border-gray-300 rounded-lg p-6 text-center">
+              <input
+                id="file"
+                type="file"
+                accept=".zip"
+                multiple
+                onChange={handleFileChange}
+                disabled={loading}
+                className="hidden"
+              />
+              <label htmlFor="file" className="cursor-pointer block">
+                {files.length > 0 ? (
+                  <div>
+                    <p className="text-sm font-medium text-blue-600">
+                      {files.length} file{files.length !== 1 ? 's' : ''} selected
+                    </p>
+                    <div className="mt-2 text-xs text-gray-600 max-h-24 overflow-y-auto">
+                      {files.map((f, idx) => (
+                        <div key={idx} className="py-1">
+                          {f.name} ({(f.size / 1024 / 1024).toFixed(2)} MB)
+                        </div>
+                      ))}
+                    </div>
+                  </div>
+                ) : (
+                  <div>
+                    <p className="text-sm font-medium text-gray-700">
+                      Click to select or drag and drop
+                    </p>
+                    <p className="text-xs text-gray-500 mt-1">ZIP files only (multiple allowed)</p>
+                  </div>
+                )}
+              </label>
+            </div>
+          </div>
+
+          <div className="bg-purple-50 border border-purple-200 rounded-lg p-4 text-sm text-purple-800">
+            <p className="font-semibold mb-2">ZIP file should contain:</p>
+            <ul className="list-disc list-inside space-y-1 text-xs">
+              <li>
+                <code className="bg-purple-100 px-1 rounded">metadata.csv</code>{' '}
+                with columns: audio_file, dialect (order is auto-generated by line count)
+              </li>
+              <li>
+                <code className="bg-purple-100 px-1 rounded">wavs/</code> subfolder with audio files (.wav)
+              </li>
+            </ul>
+          </div>
+
+          {uploadQueue.length > 0 && (
+            <div className="bg-gray-50 border border-gray-200 rounded-lg p-4 space-y-3">
+              <p className="font-semibold text-sm text-gray-700">Upload Queue:</p>
+              <div className="space-y-2 max-h-48 overflow-y-auto">
+                {uploadQueue.map((item, idx) => (
+                  <div key={idx} className="space-y-1">
+                    <div className="flex items-center gap-2 text-xs">
+                      <span className={`font-medium ${
+                        item.status === 'completed' ? 'text-green-600' :
+                        item.status === 'failed' ? 'text-red-600' :
+                        item.status === 'uploading' ? 'text-blue-600' :
+                        'text-gray-600'
+                      }`}>
+                        {item.status === 'completed' ? '✓' :
+                         item.status === 'failed' ? '✗' :
+                         item.status === 'uploading' ? '⟳' :
+                         '○'}
+                      </span>
+                      <span className="flex-1 truncate">{item.file.name}</span>
+                      {item.progress > 0 && item.progress < 100 && (
+                        <span className="text-gray-500">{item.progress}%</span>
+                      )}
+                      {item.message && <span className="text-gray-500 text-xs">{item.message}</span>}
+                    </div>
+                    {item.status === 'uploading' && (
+                      <div className="w-full bg-gray-200 rounded-full h-2 overflow-hidden">
+                        <div
+                          className="bg-blue-500 h-full transition-all duration-300"
+                          style={{ width: `${item.progress}%` }}
+                        />
+                      </div>
+                    )}
+                    {item.status === 'completed' && (
+                      <div className="w-full bg-green-200 rounded-full h-2 overflow-hidden">
+                        <div className="bg-green-500 h-full w-full" />
+                      </div>
+                    )}
+                    {item.status === 'failed' && (
+                      <div className="w-full bg-red-200 rounded-full h-2 overflow-hidden">
+                        <div className="bg-red-500 h-full w-full" />
+                      </div>
+                    )}
+                  </div>
+                ))}
+              </div>
+            </div>
+          )}
+
+          {error && (
+            <div className="p-3 bg-red-100 border border-red-400 text-red-700 rounded text-sm">
+              {error}
+            </div>
+          )}
+
+          {status && (
+            <div className={`p-3 rounded text-sm ${success ? 'bg-green-100 border border-green-400 text-green-700' : 'bg-blue-100 border border-blue-400 text-blue-700'}`}>
+              {status}
+            </div>
+          )}
+        </form>
+      </Modal>
+    </>
+  );
+}
diff --git a/src/lib/model/index.ts b/src/lib/model/index.ts
index 39cbe6a..fca29ae 100644
--- a/src/lib/model/index.ts
+++ b/src/lib/model/index.ts
@@ -1,3 +1,7 @@
 export * from "./dataset";
 export * from "./dataset_entry";
-export * from "./auth-schema";
\ No newline at end of file
+export * from "./auth-schema";
+export * from "./experiment";
+export * from "./experiment_calibration";
+export * from "./annotation";
+export * from "./participant";
\ No newline at end of file