Update index.html

index.html

@@ -1702,7 +1702,7 @@ document.addEventListener('DOMContentLoaded', function() {
         const speed = tempo / baseTempo;
         
         // 速度を0.5～2.0の範囲に制限
-        const clampedSpeed = Math.max(0.5, Math.min(2.0, speed));
+        const clampedSpeed = Math.max(0.01, Math.min(2.0, speed));
         
         playbackSpeedSlider.value = clampedSpeed;
         playbackSpeedValue.textContent = clampedSpeed.toFixed(2) + 'x';