Added Mixer8 for using up to 8 simultanious drums.

MicroDexed.ino

@@ -43,6 +43,9 @@
 #include "UI.hpp"
 #if NUM_DRUMS > 0
 #include "drums.h"
+#if NUM_DRUMS > 4
+#include "mixer8.h"
+#endif
 #endif
 
 // Audio engines
@@ -89,11 +92,21 @@ AudioMixer4                     audio_thru_mixer_l;
 AudioPlaySdRaw*                 Drum[NUM_DRUMS];
 AudioAmplifier*                 drum_volume[NUM_DRUMS];
 AudioEffectMonoStereo*          drum_mono2stereo[NUM_DRUMS];
+#if NUM_DRUMS < 5
 AudioMixer4                     drum_mixer_r;
 AudioMixer4                     drum_mixer_l;
+#else
+AudioMixer8                     drum_mixer_r;
+AudioMixer8                     drum_mixer_l;
+#endif
 #ifdef USE_FX
+#if NUM_DRUMS < 5
 AudioMixer4                     drum_reverb_send_mixer_r;
 AudioMixer4                     drum_reverb_send_mixer_l;
+#else
+AudioMixer8                     drum_reverb_send_mixer_r;
+AudioMixer8                     drum_reverb_send_mixer_l;
+#endif
 #endif
 #endif
 
@@ -585,7 +598,7 @@ void setup()
   master_mixer_r.gain(2, 0.0);
   master_mixer_l.gain(2, 0.0);
 #endif
-  master_mixer_r.gain(3, 1.0); 
+  master_mixer_r.gain(3, 1.0);
   master_mixer_l.gain(3, 1.0);
 
 #if defined(TEENSY_AUDIO_BOARD) && defined(SGTL5000_AUDIO_THRU)
@@ -810,6 +823,8 @@ void handleNoteOn(byte inChannel, byte inNumber, byte inVelocity)
       if (inNumber == drum_config[d].midinote)
       {
         uint8_t slot = drum_get_slot(drum_config[d].type);
+        if (Drum[slot]->isPlaying())
+          Drum[slot]->stop();
         drum_volume[slot]->gain(pseudo_log_curve(mapfloat(inVelocity, 0, 127, drum_config[d].vol_min, drum_config[d].vol_max)));
         drum_mono2stereo[slot]->panorama(drum_config[d].pan);
         drum_reverb_send_mixer_r.gain(slot, pseudo_log_curve(drum_config[d].reverb_send));

config.h

@@ -110,7 +110,7 @@
 #define USE_FX 1
 
 // NUMBER OF SAMPLEDRUMS
-#define NUM_DRUMS 4
+#define NUM_DRUMS 8
 #define DRUM_MIDI_CHANNEL 1
 
 // CHORUS parameters