Fixed Indexing on Bell Output Assignments

vesper/src/BellEngine/BellEngine.cpp

@@ -224,7 +224,14 @@ void BellEngine::playbackLoop() {
         // Activate note with MAXIMUM PRECISION
         activateNote(note);
 
-        // Precise timing delay
+        // Precise timing delay - validate speed to prevent division by zero
+        if (_player.speed == 0) {
+            LOG_ERROR("❌ Invalid speed=0 detected, stopping playback");
+            _player.hardStop = true;
+            _engineRunning.store(false);
+            return;
+        }
+        
         uint32_t tempoMicros = _player.speed * 1000; // Convert ms to microseconds
         preciseDelay(tempoMicros);
     }
@@ -252,7 +259,7 @@ void BellEngine::activateNote(uint16_t note) {
     if (bellConfig == 0) continue;
 
     // Convert 1-indexed config to 0-indexed bellIndex
-    uint8_t bellIndex = bellConfig - 1;
+    uint8_t bellIndex = bellConfig-1;
 
             // Additional safety check to prevent underflow crashes
             if (bellIndex >= 255) {