Fixed Volume, tested USB_HOST on T4.0 OK

MicroDexed.ino

@@ -961,7 +961,6 @@ void handleSystemReset(void)
 /******************************************************************************
    MIDI HELPER
  ******************************************************************************/
-
 bool checkMidiChannel(byte inChannel)
 {
   // check for MIDI channel
@@ -999,8 +998,7 @@ void set_volume(uint8_t v, int8_t p, uint8_t m)
 
   // float v = (float)(a * (a + 2))/(float)(1 << 20); //  (pseudo-) logarithmic curve for volume control
   // http://files.csound-tutorial.net/floss_manual/Release03/Cs_FM_03_ScrapBook/b-panning-and-spatialization.html
-  volume_r.gain(tmp3 * sinf(tmp2 * PI / 2));
-  volume_l.gain(tmp3 * cosf(tmp2 * PI / 2));
+ 
 
 #ifdef DEBUG
   Serial.print(F("Setting volume: VOL="));
@@ -1020,23 +1018,23 @@ void set_volume(uint8_t v, int8_t p, uint8_t m)
   switch (m)
   {
     case 0:
-      volume_r.gain(1.0);
-      volume_l.gain(1.0);
+      volume_r.gain(tmp3 * sinf(tmp2 * PI / 2));
+      volume_l.gain(tmp3 * cosf(tmp2 * PI / 2));
       stereomono1.stereo(true);
       break;
     case 1:
-      volume_r.gain(1.0);
-      volume_l.gain(1.0);
+      volume_r.gain(tmp3 * sinf(tmp2 * PI / 2));
+      volume_l.gain(tmp3 * cosf(tmp2 * PI / 2));
       stereomono1.stereo(false);
       break;
     case 2:
-      volume_r.gain(1.0);
+      volume_r.gain(tmp3 * sinf(tmp2 * PI / 2));
       volume_l.gain(0.0);
       stereomono1.stereo(false);
       break;
     case 3:
       volume_r.gain(0.0);
-      volume_l.gain(1.0);
+      volume_l.gain(tmp3 * cosf(tmp2 * PI / 2));
       stereomono1.stereo(false);
       break;
   }

source_microdexed.h

@@ -12,10 +12,20 @@ class AudioSourceMicroDexed : public AudioStream, public Dexed {
          AudioSourceMicroDexed(int sample_rate) : AudioStream(0, NULL), Dexed(sample_rate) { 
             };   
          void update(void) {
+            if (in_update) {
+               xrun++;
+	             return;
+	          }
+            else in_update = true;
+		
             elapsedMicros render_time;
             audio_block_t *lblock;
             lblock = allocate();
-            if (!lblock) return;
+            if (!lblock) {
+              in_update = false;
+              return;
+              
+            }
             getSamples(AUDIO_BLOCK_SAMPLES, lblock->data);
             if (render_time > audio_block_time_us) // everything greater 2.9ms is a buffer underrun!
               xrun++;
@@ -24,6 +34,8 @@ class AudioSourceMicroDexed : public AudioStream, public Dexed {
            
             transmit(lblock, 0);
             release(lblock);
+            in_update = false;
         };                                                           
 private:
+        volatile bool in_update = false;
 };