diff --git a/dist/index.html b/dist/index.html
index 94e2b20..1effacd 100644
--- a/dist/index.html
+++ b/dist/index.html
@@ -257,7 +257,7 @@ async function transcribe(blob) {
   const tStart = performance.now();
 
   const form = new FormData();
-  form.append('file', blob, blob.type === 'audio/wav' ? 'audio.wav' : 'audio.webm');
+  form.append('file', blob, 'audio.webm');
   form.append('model', 'whisper-large-v3');
   form.append('language', 'it');
 
@@ -274,7 +274,6 @@ async function transcribe(blob) {
     return data.error ? { text: '', error: data.error } : { text: data.text || '', error: null };
   } catch(e) {
     console.log('[HTTP] ERR', e);
-    alert('Ошибка транскрипции: ' + (e.message || e));
     return { text: '', error: 'network' };
   }
 }
@@ -365,15 +364,11 @@ async function startRecording() {
   const opts = mimeType ? { mimeType } : {};
   mediaRecorder = new MediaRecorder(stream, opts);
   mediaRecorder.ondataavailable = e => { if (e.data.size > 0) audioChunks.push(e.data); };
-  mediaRecorder.onstop = async () => {
+  mediaRecorder.onstop = () => {
     stopMicMeter();
     recordDuration = (Date.now() - recordStartTime) / 1000;
-    let blob = new Blob(audioChunks, { type: mimeType || 'audio/webm' });
+    userAudioBlob = new Blob(audioChunks, { type: mimeType || 'audio/webm' });
     stream.getTracks().forEach(t => t.stop());
-    // Обрезаем тишину
-    const trimmed = await trimSilence(blob);
-    if (trimmed && trimmed.size > 0) blob = trimmed;
-    userAudioBlob = blob;
     enable('btnCompare', true);
     enable('btnStereo', true);
     enable('btnPlayUser', true);
@@ -558,7 +553,7 @@ function pitchFrame(data, start, len, sr) {
   return bestR > 0.30 ? sr / bestLag : 0;
 }
 
-// ---------- Обрезка тишины (щелчок в начале, тишина в конце) ----------
+// ---------- Обрезка тишины — возвращает {buffer, startSample, endSample} ----------
 async function trimSilence(blob) {
   try {
     const ctx = new (window.OfflineAudioContext || window.webkitOfflineAudioContext)(1, 1, 44100);
@@ -568,7 +563,6 @@ async function trimSilence(blob) {
     const sr = buf.sampleRate;
     const len = data.length;
 
-    // RMS по окнам 10мс
     const win = Math.floor(sr * 0.01);
     const rms = [];
     let maxRms = 0;
@@ -579,17 +573,14 @@ async function trimSilence(blob) {
       rms.push(v);
       if (v > maxRms) maxRms = v;
     }
-    if (maxRms < 0.001) return blob; // тишина
+    if (maxRms < 0.001) return null;
 
-    const threshold = maxRms * 0.02; // 2% от пика
+    const threshold = maxRms * 0.02;
 
-    // Начало — первый кадр выше порога
     let startIdx = 0;
     for (let i = 0; i < rms.length; i++) {
       if (rms[i] > threshold) { startIdx = Math.max(0, i - 2); break; }
     }
-
-    // Конец — последний кадр выше порога
     let endIdx = rms.length - 1;
     for (let i = rms.length - 1; i >= 0; i--) {
       if (rms[i] > threshold) { endIdx = Math.min(rms.length - 1, i + 2); break; }
@@ -597,33 +588,11 @@ async function trimSilence(blob) {
 
     const startSample = startIdx * win;
     const endSample = Math.min((endIdx + 1) * win, len);
-    if (endSample - startSample < sr * 0.08) return blob; // слишком коротко
+    if (endSample - startSample < sr * 0.08) return null;
 
-    // WAV: 44-byte header + PCM16
-    const trimmed = data.slice(startSample, endSample);
-    const numSamples = trimmed.length;
-    const wav = new ArrayBuffer(44 + numSamples * 2);
-    const view = new DataView(wav);
-    const writeStr = (off, s) => { for (let i = 0; i < s.length; i++) view.setUint8(off + i, s.charCodeAt(i)); };
-    writeStr(0, 'RIFF');
-    view.setUint32(4, 36 + numSamples * 2, true);
-    writeStr(8, 'WAVE');
-    writeStr(12, 'fmt ');
-    view.setUint32(16, 16, true);
-    view.setUint16(20, 1, true);
-    view.setUint16(22, 1, true);
-    view.setUint32(24, sr, true);
-    view.setUint32(28, sr * 2, true);
-    view.setUint16(32, 2, true);
-    view.setUint16(34, 16, true);
-    writeStr(36, 'data');
-    view.setUint32(40, numSamples * 2, true);
-    for (let i = 0; i < numSamples; i++) {
-      const s = Math.max(-1, Math.min(1, trimmed[i]));
-      view.setInt16(44 + i * 2, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
-    }
-    return new Blob([wav], { type: 'audio/wav' });
-  } catch(e) { return blob; }
+    const trimmedBuf = new (window.OfflineAudioContext || window.webkitOfflineAudioContext)(1, endSample - startSample, sr);
+    return { buffer: trimmedBuf, data: data.slice(startSample, endSample), sr, startSample, endSample };
+  } catch(e) { return null; }
 }
 
 </script>
@@ -766,7 +735,7 @@ async function doCompare(blob, originalText, duration) {
 <script>
 // ---------- Глобальные переменные и инициализация ----------
 const GROQ_API_KEY = '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';
-const VERSION = 'v73';
+const VERSION = 'v74';
 
 let mediaRecorder, audioChunks = [], userAudioBlob = null, ttsText = '';
 let isRecording = false, isAnalyzing = false, micAnalyser = null, micAnimId = null;
diff --git a/js/audio.js b/js/audio.js
index 5b44b87..508e00f 100644
--- a/js/audio.js
+++ b/js/audio.js
@@ -62,15 +62,11 @@ async function startRecording() {
   const opts = mimeType ? { mimeType } : {};
   mediaRecorder = new MediaRecorder(stream, opts);
   mediaRecorder.ondataavailable = e => { if (e.data.size > 0) audioChunks.push(e.data); };
-  mediaRecorder.onstop = async () => {
+  mediaRecorder.onstop = () => {
     stopMicMeter();
     recordDuration = (Date.now() - recordStartTime) / 1000;
-    let blob = new Blob(audioChunks, { type: mimeType || 'audio/webm' });
+    userAudioBlob = new Blob(audioChunks, { type: mimeType || 'audio/webm' });
     stream.getTracks().forEach(t => t.stop());
-    // Обрезаем тишину
-    const trimmed = await trimSilence(blob);
-    if (trimmed && trimmed.size > 0) blob = trimmed;
-    userAudioBlob = blob;
     enable('btnCompare', true);
     enable('btnStereo', true);
     enable('btnPlayUser', true);
@@ -255,7 +251,7 @@ function pitchFrame(data, start, len, sr) {
   return bestR > 0.30 ? sr / bestLag : 0;
 }
 
-// ---------- Обрезка тишины (щелчок в начале, тишина в конце) ----------
+// ---------- Обрезка тишины — возвращает {buffer, startSample, endSample} ----------
 async function trimSilence(blob) {
   try {
     const ctx = new (window.OfflineAudioContext || window.webkitOfflineAudioContext)(1, 1, 44100);
@@ -265,7 +261,6 @@ async function trimSilence(blob) {
     const sr = buf.sampleRate;
     const len = data.length;
 
-    // RMS по окнам 10мс
     const win = Math.floor(sr * 0.01);
     const rms = [];
     let maxRms = 0;
@@ -276,17 +271,14 @@ async function trimSilence(blob) {
       rms.push(v);
       if (v > maxRms) maxRms = v;
     }
-    if (maxRms < 0.001) return blob; // тишина
+    if (maxRms < 0.001) return null;
 
-    const threshold = maxRms * 0.02; // 2% от пика
+    const threshold = maxRms * 0.02;
 
-    // Начало — первый кадр выше порога
     let startIdx = 0;
     for (let i = 0; i < rms.length; i++) {
       if (rms[i] > threshold) { startIdx = Math.max(0, i - 2); break; }
     }
-
-    // Конец — последний кадр выше порога
     let endIdx = rms.length - 1;
     for (let i = rms.length - 1; i >= 0; i--) {
       if (rms[i] > threshold) { endIdx = Math.min(rms.length - 1, i + 2); break; }
@@ -294,31 +286,9 @@ async function trimSilence(blob) {
 
     const startSample = startIdx * win;
     const endSample = Math.min((endIdx + 1) * win, len);
-    if (endSample - startSample < sr * 0.08) return blob; // слишком коротко
+    if (endSample - startSample < sr * 0.08) return null;
 
-    // WAV: 44-byte header + PCM16
-    const trimmed = data.slice(startSample, endSample);
-    const numSamples = trimmed.length;
-    const wav = new ArrayBuffer(44 + numSamples * 2);
-    const view = new DataView(wav);
-    const writeStr = (off, s) => { for (let i = 0; i < s.length; i++) view.setUint8(off + i, s.charCodeAt(i)); };
-    writeStr(0, 'RIFF');
-    view.setUint32(4, 36 + numSamples * 2, true);
-    writeStr(8, 'WAVE');
-    writeStr(12, 'fmt ');
-    view.setUint32(16, 16, true);
-    view.setUint16(20, 1, true);
-    view.setUint16(22, 1, true);
-    view.setUint32(24, sr, true);
-    view.setUint32(28, sr * 2, true);
-    view.setUint16(32, 2, true);
-    view.setUint16(34, 16, true);
-    writeStr(36, 'data');
-    view.setUint32(40, numSamples * 2, true);
-    for (let i = 0; i < numSamples; i++) {
-      const s = Math.max(-1, Math.min(1, trimmed[i]));
-      view.setInt16(44 + i * 2, s < 0 ? s * 0x8000 : s * 0x7FFF, true);
-    }
-    return new Blob([wav], { type: 'audio/wav' });
-  } catch(e) { return blob; }
+    const trimmedBuf = new (window.OfflineAudioContext || window.webkitOfflineAudioContext)(1, endSample - startSample, sr);
+    return { buffer: trimmedBuf, data: data.slice(startSample, endSample), sr, startSample, endSample };
+  } catch(e) { return null; }
 }
diff --git a/js/main.js b/js/main.js
index 03a2bc5..1e9a140 100644
--- a/js/main.js
+++ b/js/main.js
@@ -1,6 +1,6 @@
 // ---------- Глобальные переменные и инициализация ----------
 const GROQ_API_KEY = '';
-const VERSION = 'v73';
+const VERSION = 'v74';
 
 let mediaRecorder, audioChunks = [], userAudioBlob = null, ttsText = '';
 let isRecording = false, isAnalyzing = false, micAnalyser = null, micAnimId = null;
diff --git a/js/transcribe.js b/js/transcribe.js
index 461cdda..f5313db 100644
--- a/js/transcribe.js
+++ b/js/transcribe.js
@@ -5,7 +5,7 @@ async function transcribe(blob) {
   const tStart = performance.now();
 
   const form = new FormData();
-  form.append('file', blob, blob.type === 'audio/wav' ? 'audio.wav' : 'audio.webm');
+  form.append('file', blob, 'audio.webm');
   form.append('model', 'whisper-large-v3');
   form.append('language', 'it');
 
@@ -22,7 +22,6 @@ async function transcribe(blob) {
     return data.error ? { text: '', error: data.error } : { text: data.text || '', error: null };
   } catch(e) {
     console.log('[HTTP] ERR', e);
-    alert('Ошибка транскрипции: ' + (e.message || e));
     return { text: '', error: 'network' };
   }
 }