Fixes for chorus intensity and loading values at startup.

MicroMDAEPiano.ino

@@ -239,19 +239,17 @@ void setup()
 
   // chorus modulation fixed
   modulator.begin(CHORUS_WAVEFORM);
-  modulator.amplitude(1.0);
-  modulator.frequency(1.0);
   modulator.phase(0);
   modulator.offset(0.0);
   inverter.gain(-1.0); // change phase for second moduleated delay
 
   // internal mixing of original signal(0), reverb(1) and chorus(2)
-  mixer_r.gain(0, 1.0);
-  mixer_l.gain(0, 1.0);
-  mixer_r.gain(1, 0.5);
-  mixer_l.gain(1, 0.5);
-  mixer_r.gain(2, 0.5);
-  mixer_l.gain(2, 0.5);
+  mixer_r.gain(0, 0.5);
+  mixer_l.gain(0, 0.5);
+  mixer_r.gain(1, 0.2);
+  mixer_l.gain(1, 0.2);
+  mixer_r.gain(2, 0.3);
+  mixer_l.gain(2, 0.3);
 
   // set master volume
   set_master_volume(master_volume);
@@ -558,9 +556,9 @@ void config_from_eeprom(void)
 #ifdef SHOW_DEBUG
     Serial.println(F(" - mismatch -> loading initial configuration."));
 #endif
-    set_complete_configuration();
     EEPROM.update(EEPROM_SOUND, sound);
   }
+  set_complete_configuration();
 
 #ifdef SHOW_DEBUG
   show_sound();

UI.hpp

@@ -2057,7 +2057,7 @@ void set_chorus_intensity(uint8_t value)
   Serial.print(F("Set CHORUS_INTENSITY "));
   Serial.println(value);
 #endif
-  modulator.amplitude(float(value) / 100);
+  modulator.amplitude(mapfloat(float(value), ENC_CHORUS_INTENSITY_MIN, ENC_CHORUS_INTENSITY_MAX, 0.0, 0.5));
   configuration.chorus_intensity = value;
 }
 

config.h

@@ -61,8 +61,8 @@
 #define REDUCE_LOUDNESS 0
 #define USE_XFADE_DATA 1
 // CHORUS parameters
-#define INTERPOLATION_WINDOW_SIZE 7 // use only odd numbers!!!
-#define INTERPOLATE QUADRATIC // LINEAR QUADRATIC COSINE CUBIC LAGRANGE 
+#define INTERPOLATION_WINDOW_SIZE 13 // 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 (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!
 

effect_modulated_delay.cpp

@@ -41,7 +41,7 @@ boolean AudioEffectModulatedDelay::begin(short *delayline, int d_length)
 #if 0
   Serial.print(F("AudioEffectModulatedDelay.begin(Chorus delay line length = "));
   Serial.print(d_length);
-  Serial.println(F(")");
+  Serial.println(F(")"));
 #endif
 
   _delayline = NULL;
@@ -60,6 +60,9 @@ boolean AudioEffectModulatedDelay::begin(short *delayline, int d_length)
   _delay_length_half = _delay_length / 2;
 
   memset(_delayline, 0, sizeof(int16_t)*_delay_length);
+#ifdef INTERPOLATE
+  modulation_interpolate = new interpolation();
+#endif
 
   return (true);
 }
@@ -76,10 +79,6 @@ void AudioEffectModulatedDelay::update(void)
   if (_delayline == NULL)
     return;
 
-#ifdef INTERPOLATE
-  interpolation modulation_interpolate;
-#endif
-
   block = receiveWritable(0);
   modulation = receiveReadOnly(1);
 
@@ -87,9 +86,9 @@ void AudioEffectModulatedDelay::update(void)
   int8_t j;
   float x[INTERPOLATION_WINDOW_SIZE];
   float y[INTERPOLATION_WINDOW_SIZE];
-  modulation_interpolate.valuelenXY(INTERPOLATION_WINDOW_SIZE);
-  modulation_interpolate.valueX(x);
-  modulation_interpolate.valueY(y);
+  modulation_interpolate->valuelenXY(INTERPOLATION_WINDOW_SIZE);
+  modulation_interpolate->valueX(x);
+  modulation_interpolate->valueY(y);
 #endif
 
   bp = block->data;
@@ -122,23 +121,23 @@ void AudioEffectModulatedDelay::update(void)
         c++; // because 42 is the answer! ;-)
       }
 
-      modulation_interpolate.valueI(mod_idx - int(mod_idx + 0.5));
+      modulation_interpolate->valueI(mod_idx - int(mod_idx + 0.5));
 
 #if INTERPOLATE == LINEAR
-      *bp = int(modulation_interpolate.LinearInterpolate() + 0.5);
+      *bp = int(modulation_interpolate->LinearInterpolate() + 0.5);
 #elif INTERPOLATE == QUDRATIC
-      *bp = int(modulation_interpolate.QuadraticInterpolate() + 0.5);
+      *bp = int(modulation_interpolate->QuadraticInterpolate() + 0.5);
 #elif INTERPOLATE == COSINE
-      *bp = int(modulation_interpolate.CosineInterpolate() + 0.5);
+      *bp = int(modulation_interpolate->CosineInterpolate() + 0.5);
 #elif INTERPOLATE == CUBIC
-      *bp = int(modulation_interpolate.CubicInterpolate() + 0.5);
+      *bp = int(modulation_interpolate->CubicInterpolate() + 0.5);
 #elif INTERPOLATE == LAGRANGE
-      *bp = int(modulation_interpolate.LagrangeInterpolate() + 0.5);
+      *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) % _delay_length;
       if (c_mod_idx < 0)
-        *bp = _delayline[_delay_length + c_mod_idx];
+        *bp = _delayline[_delay_length - 1 + c_mod_idx];
       else
         *bp = _delayline[c_mod_idx];
 #endif
@@ -146,7 +145,7 @@ void AudioEffectModulatedDelay::update(void)
       // No interpolation - should sound really bad...
       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];
+        *bp = _delayline[_delay_length - 1 + c_mod_idx];
       else
         *bp = _delayline[c_mod_idx];
 #endif

effect_modulated_delay.h

@@ -26,6 +26,7 @@
 
 #include "Arduino.h"
 #include "AudioStream.h"
+#include "config.h"
 
 /*************************************************************************/
 
@@ -51,6 +52,10 @@ class AudioEffectModulatedDelay :
   private:
     audio_block_t *inputQueueArray[2];
 
+#ifdef INTERPOLATE
+    class interpolation *modulation_interpolate;
+#endif
+
     int16_t *_delayline;
     int16_t _circ_idx;
     uint16_t _max_delay_length;