Code cleanup and small fixes.

MicroMDAEPiano.ino

@@ -58,8 +58,6 @@ AudioEffectModulatedDelay   modchorus_r;
 AudioEffectModulatedDelay   modchorus_l;
 AudioSynthWaveform       modulator;
 AudioFilterBiquad        modulator_filter;
-AudioFilterBiquad        chorus_filter_r;
-AudioFilterBiquad        chorus_filter_l;
 AudioConnection          patchCord0(queue_r, peak_r);
 AudioConnection          patchCord1(queue_l, peak_l);
 AudioConnection          patchCord2(queue_r, freeverb_r);
@@ -72,12 +70,8 @@ AudioConnection          patchCord8(modulator_filter, inverter);
 AudioConnection          patchCord9(inverter, 0, modchorus_l, 1);
 AudioConnection          patchCord10(queue_r, 0, mixer_r, 0);
 AudioConnection          patchCord11(queue_l, 0, mixer_l, 0);
-AudioConnection          patchCord12(modchorus_r, chorus_filter_r);
-AudioConnection          patchCord13(modchorus_l, chorus_filter_l);
-AudioConnection          patchCord14(chorus_filter_r, 0, mixer_r, 2);
-AudioConnection          patchCord15(chorus_filter_l, 0, mixer_l, 2);
-AudioConnection          patchCord16(modchorus_r, 0, mixer_r, 2);
-AudioConnection          patchCord17(modchorus_l, 0, mixer_l, 2);
+AudioConnection          patchCord12(modchorus_r, 0, mixer_r, 2);
+AudioConnection          patchCord13(modchorus_l, 0, mixer_l, 2);
 AudioConnection          patchCord18(freeverb_r, 0, mixer_r, 1);
 AudioConnection          patchCord19(freeverb_l, 0, mixer_l, 1);
 AudioConnection          patchCord20(mixer_r, volume_r);
@@ -244,10 +238,8 @@ void setup()
   inverter.gain(-1.0); // change phase for second modulated delay (faked stereo mode)
   modchorus_r.offset(15.0);
   modchorus_r.intensity(1.0);
-  chorus_filter_r.setLowpass(0, 10000.0, CHORUS_MODULATOR_FILTER_Q);
   modchorus_l.offset(15.0);
   modchorus_l.intensity(1.0);
-  chorus_filter_l.setLowpass(0, 10000.0, CHORUS_MODULATOR_FILTER_Q);
 
   // internal mixing of original signal(0), reverb(1) and chorus(2)
   mixer_r.gain(VOL_MAIN, 0.5);

effect_modulated_delay.cpp

@@ -59,12 +59,6 @@ boolean AudioEffectModulatedDelay::begin(short *delayline, int d_length)
   _delayline = delayline;
   _delay_length = d_length;
 
-#ifdef CHORUS_INTERPOLATION_MODE
-  spline = new Spline;
-  spline->setPoints(x, y, int(CHORUS_INTERPOLATION_WINDOW_SIZE));
-  spline->setDegree(CHORUS_INTERPOLATION_MODE);
-#endif
-
   return (true);
 }
 
@@ -97,16 +91,13 @@ void AudioEffectModulatedDelay::update(void)
         _circ_idx = 0;
       _delayline[_circ_idx] = *bp;
 
-      // Calculate the modulation index as a float in the interval [-1.0,1.0] for interpolation later.
-      // The index is located around the half of the delay length multiplied by the current amount of the modulator
+      // Calculate the modulation-index as a floating point number fo later interpolation
       mod_idx = _delay_offset + ((float(*mp) / SHRT_MAX) * _modulation_intensity);
       mod_fraction = modff(mod_idx, &mod_number);
-      
+
       // linear interpolation
       c_mod_idx = _circ_idx - round(mod_idx);
-      if (mod_idx < 0.0) // c_mod_idx is the pointer to the value in the circular buffer at the current modulation index
-        c_mod_idx--;
-      c_mod_idx %= _delay_length; // The modulation index pointer plus the value of the current window pointer
+      c_mod_idx %= _delay_length;
       if (c_mod_idx < 0) // check for negative offsets and correct them
         c_mod_idx += _delay_length;
       if (c_mod_idx - 1 < 0)
@@ -124,7 +115,7 @@ void AudioEffectModulatedDelay::update(void)
         idx[0] = c_mod_idx;
         idx[1] = c_mod_idx + 1;
       }
-      *bp = round(float(_delayline[idx[0]]) * (1.0 - mod_fraction) + float(_delayline[idx[1]]) * mod_fraction);
+      *bp = round(float(_delayline[idx[0]]) * mod_fraction + float(_delayline[idx[1]]) * (1.0 - mod_fraction));
 
       bp++; // next audio data
       mp++; // next modulation data