Small fixes for chorus.

UI.hpp

@@ -212,7 +212,7 @@ char* get_comp_attack_value_text(void)
 char comp_decay_value_text1[] = "       ";
 char* get_comp_decay_value_text(void)
 {
-  sprintf(comp_decay_value_text1, "%0.1f dB/s", (float)configuration.comp_decay / 10);
+  sprintf(comp_decay_value_text1, "%0.1f dB/s", float(configuration.comp_decay) / 10);
 
   return (comp_decay_value_text1);
 }
@@ -228,7 +228,7 @@ char* get_tune_value_text(void)
 char chorus_frequency_value_text1[] = "       ";
 char* get_chorus_frequency_value_text(void)
 {
-  sprintf(chorus_frequency_value_text1, "%2.1f Hz", (float)configuration.chorus_frequency / 10);
+  sprintf(chorus_frequency_value_text1, "%2.1f Hz", float(configuration.chorus_frequency) / 10);
 
   return (chorus_frequency_value_text1);
 }
@@ -236,7 +236,7 @@ char* get_chorus_frequency_value_text(void)
 char chorus_delay_value_text1[] = "       ";
 char* get_chorus_delay_value_text(void)
 {
-  sprintf(chorus_delay_value_text1, "%2d ms", configuration.chorus_delay);
+  sprintf(chorus_delay_value_text1, "%2.1f ms", float(configuration.chorus_delay) / 10);
 
   return (chorus_delay_value_text1);
 }
@@ -2046,8 +2046,8 @@ void set_chorus_delay(uint8_t value)
   Serial.print(F("Set CHORUS_DELAY "));
   Serial.println(value);
 #endif
-  modchorus_r.setDelayLength(float(value));
-  modchorus_l.setDelayLength(float(value));
+  modchorus_r.setDelay(float(value / 10));
+  modchorus_l.setDelay(float(value / 10));
   configuration.chorus_delay = value;
 }
 

config.h

@@ -64,7 +64,7 @@
 #define INTERPOLATION_WINDOW_SIZE 7 // use only odd numbers!!!
 #define INTERPOLATE QUADRATIC // LINEAR QUADRATIC COSINE CUBIC LAGRANGE 
 #define CHORUS_WAVEFORM WAVEFORM_SINE // WAVEFORM_SINE WAVEFORM_SAWTOOTH WAVEFORM_SAWTOOTH_REVERSE WAVEFORM_SQUARE WAVEFORM_TRIANGLE
-#define CHORUS_DELAY_LENGTH_SAMPLES (16*AUDIO_BLOCK_SAMPLES)
+#define CHORUS_DELAY_LENGTH_SAMPLES (14*AUDIO_BLOCK_SAMPLES) // one AUDIO_BLOCK_SAMPLES = 2.902ms; you need doubled length, e.g. delay point is 20ms, so you need up to 40ms delay!
 
 //*************************************************************************************************
 //* DEBUG OUTPUT SETTINGS
@@ -237,8 +237,8 @@
 #define ENC_CHORUS_FREQUENCY_DEFAULT 30
 //
 #define ENC_CHORUS_DELAY_MIN 0
-#define ENC_CHORUS_DELAY_MAX 20
-#define ENC_CHORUS_DELAY_DEFAULT 15
+#define ENC_CHORUS_DELAY_MAX 200
+#define ENC_CHORUS_DELAY_DEFAULT 200
 //
 #define ENC_CHORUS_INTENSITY_MIN 0
 #define ENC_CHORUS_INTENSITY_MAX 100

effect_modulated_delay.cpp

@@ -39,9 +39,9 @@
 boolean AudioEffectModulatedDelay::begin(short *delayline, int d_length)
 {
 #if 0
-  Serial.print("AudioEffectModulatedDelay.begin(Chorus delay line length = ");
+  Serial.print(F("AudioEffectModulatedDelay.begin(Chorus delay line length = "));
   Serial.print(d_length);
-  Serial.println(")");
+  Serial.println(F(")");
 #endif
 
                  _delayline = NULL;
@@ -136,7 +136,7 @@ void AudioEffectModulatedDelay::update(void)
       *bp = int(modulation_interpolate.LagrangeInterpolate() + 0.5);
 #else
       // No interpolation - should sound really bad...
-      int16_t c_mod_idx = int(mod_idx + 0.5) + _circ_idx;
+      int16_t c_mod_idx = (int(mod_idx + 0.5) + _circ_idx) % _delay_length;
       if (c_mod_idx < 0)
         *bp = _delayline[_delay_length + c_mod_idx];
       else
@@ -144,7 +144,7 @@ void AudioEffectModulatedDelay::update(void)
 #endif
 #else
       // No interpolation - should sound really bad...
-      int16_t c_mod_idx = int(mod_idx + 0.5) + _circ_idx;
+      int16_t c_mod_idx = (int(mod_idx + 0.5) + _circ_idx) % _delay_length;
       if (c_mod_idx < 0)
         *bp = _delayline[_delay_length + c_mod_idx];
       else
@@ -167,13 +167,8 @@ void AudioEffectModulatedDelay::update(void)
     release(modulation);
 }
 
-void AudioEffectModulatedDelay::setDelayLength(float milliseconds)
+void AudioEffectModulatedDelay::setDelay(float milliseconds)
 {
-  _delay_length = min(AUDIO_SAMPLE_RATE / milliseconds, _max_delay_length);
+  _delay_length = min(AUDIO_SAMPLE_RATE * milliseconds / 500, _max_delay_length);
   _delay_length_half = _delay_length / 2;
 }
-
-float AudioEffectModulatedDelay::getMaxDelayLength(void)
-{
-  return (AUDIO_SAMPLE_RATE / _max_delay_length);
-}

effect_modulated_delay.h

@@ -46,8 +46,7 @@ class AudioEffectModulatedDelay :
 
     boolean begin(short *delayline, int delay_length);
     virtual void update(void);
-    virtual void setDelayLength(float milliseconds);
-    virtual float getMaxDelayLength(void);
+    virtual void setDelay(float milliseconds);
     
   private:
     audio_block_t *inputQueueArray[2];