use program change to switch function of sust pedal (switch between tap tempo / activate sustain

delay.c

@@ -44,8 +44,8 @@ void delay_process(
     for( size_t i = 0; i < frame_size; ++i ) {
         if( delay->duration > 0 ) {
             out[i] =
-                0.5 * in[i]
-                + 0.5 * delay->mix * delay->buf[ delay->buf_idx ];
+                in[i]
+                + delay->mix * delay->buf[ delay->buf_idx ];
 
             delay->buf[ delay->buf_idx ] *= delay->feedback;
             delay->buf[ delay->buf_idx ] += (1.0 - delay->feedback) * in[i];

guitfx.c

@@ -35,6 +35,8 @@ struct data {
 	struct delay delay;
 	struct sust sust;
 
+        unsigned prog;
+
 	//! elapsed time in number of samples
 	uint64_t time;
 };
@@ -87,12 +89,16 @@ static void on_process(void *userdata, struct spa_io_position *position)
 									    // expr pedal
 										float val_f = ((float)midi_data[2]) / 128.0;
 										printf("Expr Pedal %f\n", val_f);
-
+										if ( val_f > 0.1 ) {
 										  data->delay.mix = val_f;
+										} else {
+										  data->delay.mix = 0.0;
+										}
 									    break;
 
 								    case 0x42:
 										// sust pedal
+								      if( data->prog == 1 ) {
 										if( midi_data[2] >= 64) {
 											sust_swap( &data->sust );
 										    data->sust.playing = true;
@@ -102,21 +108,30 @@ static void on_process(void *userdata, struct spa_io_position *position)
 										} else {
 											data->sust.playing = false;
 										}
+								      }
 
 										// tap tempo
+										if( data->prog == 0 ) {
 										  uint64_t cur_tap = frame + c->offset;
 										  uint64_t duration = cur_tap - data->last_tap;
 										  data->last_tap = cur_tap;
 										  if( duration < (4*position->clock.rate.denom) ) {
-    									  delay_set_time( &data->delay, duration/4 );
+										    delay_set_time( &data->delay, duration );
 										  }
+
+
+										  sust_resize( &data->sust, duration );
+										}
+
 										break;
 								}
+
 								break;
 
 							case 0xc0:
 							    // program change
 								printf("program change: %u\n", midi_data[1]);
+								data->prog = midi_data[1];
 							    break;
 						}
 					} else {
@@ -137,10 +152,11 @@ static void on_process(void *userdata, struct spa_io_position *position)
 
 
 	float * const in = pw_filter_get_dsp_buffer(data->guit_in_port, n_samples);
+	float tmp[n_samples];
 	float * out = pw_filter_get_dsp_buffer(data->out_port, n_samples);
 	if( in && out ) {
-        //delay_process( &data->delay, n_samples, in, out );
-        sust_process( &data->sust, n_samples, in, out );
+	  sust_process( &data->sust, n_samples, in, tmp );
+	  delay_process( &data->delay, n_samples, tmp, out );
 	}
 }
 
@@ -161,6 +177,7 @@ int main(int argc, char *argv[])
 
 	delay_init( &data.delay );
 	sust_init( &data.sust );
+	data.prog = 0;
 
 	const struct spa_pod *params[1];
 	uint8_t buffer[1024];