Merge branch 'dev_volume_per_instance' of dronus/MicroDexed into dev

Thanks. A name change from "Loudness" to "Volume" for the instance is ok, but how caling the overall "sum" volume than?

MicroDexed.ino

@@ -614,12 +614,12 @@ void handleControlChange(byte inChannel, byte inCtrl, byte inValue)
           configuration.dexed[instance_id].portamento_time = inValue;
           MicroDexed[instance_id]->setPortamentoMode(configuration.dexed[instance_id].portamento_mode, configuration.dexed[instance_id].portamento_glissando, configuration.dexed[instance_id].portamento_time);
           break;
-        case 7: // Volume
+        case 7: // Instance Volume
 #ifdef DEBUG
           Serial.println(F("VOLUME CC"));
 #endif
-          configuration.vol = map(inValue, 0, 0x7f, VOLUME_MIN, VOLUME_MAX);
+          configuration.dexed[instance_id].loudness = map(inValue, 0, 0x7f,LOUDNESS_MIN, LOUDNESS_MAX);
-          set_volume(configuration.vol, configuration.pan, configuration.mono);
+          MicroDexed[instance_id]->fx.Gain = mapfloat(configuration.dexed[instance_id].loudness, LOUDNESS_MIN, LOUDNESS_MAX, 0.0, 1.0);
           break;
         case 10: // Pan
 #ifdef DEBUG