diff --git a/MicroMDAEPiano.ino b/MicroMDAEPiano.ino
index b30c4d4..0cc1605 100644
--- a/MicroMDAEPiano.ino
+++ b/MicroMDAEPiano.ino
@@ -53,6 +53,7 @@ AudioMixer4              mixer_r;
 AudioMixer4              mixer_l;
 AudioAmplifier           volume_r;
 AudioAmplifier           volume_l;
+AudioAmplifier           inverter;
 AudioEffectModulatedDelay   modchorus_r;
 AudioEffectModulatedDelay   modchorus_l;
 AudioSynthWaveform       modulator;
@@ -63,24 +64,25 @@ AudioConnection          patchCord3(queue_l, freeverb_l);
 AudioConnection          patchCord4(queue_r, 0, modchorus_r, 0);
 AudioConnection          patchCord5(queue_l, 0, modchorus_l, 0);
 AudioConnection          patchCord6(modulator, 0, modchorus_r, 1);
-AudioConnection          patchCord7(modulator, 0, modchorus_l, 1);
-AudioConnection          patchCord8(queue_r, 0, mixer_r, 0);
-AudioConnection          patchCord9(queue_l, 0, mixer_l, 0);
-AudioConnection          patchCord10(modchorus_r, 0, mixer_r, 2);
-AudioConnection          patchCord11(modchorus_l, 0, mixer_l, 2);
-AudioConnection          patchCord12(freeverb_r, 0, mixer_r, 1);
-AudioConnection          patchCord13(freeverb_l, 0, mixer_l, 1);
-AudioConnection          patchCord14(mixer_r, volume_r);
-AudioConnection          patchCord15(mixer_l, volume_l);
+AudioConnection          patchCord7(modulator, inverter);
+AudioConnection          patchCord8(inverter, 0, modchorus_l, 1);
+AudioConnection          patchCord9(queue_r, 0, mixer_r, 0);
+AudioConnection          patchCord10(queue_l, 0, mixer_l, 0);
+AudioConnection          patchCord11(modchorus_r, 0, mixer_r, 2);
+AudioConnection          patchCord12(modchorus_l, 0, mixer_l, 2);
+AudioConnection          patchCord13(freeverb_r, 0, mixer_r, 1);
+AudioConnection          patchCord14(freeverb_l, 0, mixer_l, 1);
+AudioConnection          patchCord15(mixer_r, volume_r);
+AudioConnection          patchCord16(mixer_l, volume_l);
 #if defined(TEENSY_AUDIO_BOARD)
 AudioOutputI2S           i2s1;
-AudioConnection          patchCord16(volume_r, 0, i2s1, 0);
-AudioConnection          patchCord17(volume_l, 0, i2s1, 1);
+AudioConnection          patchCord17(volume_r, 0, i2s1, 0);
+AudioConnection          patchCord18(volume_l, 0, i2s1, 1);
 AudioControlSGTL5000     sgtl5000_1;
 #elif defined(TGA_AUDIO_BOARD)
 AudioOutputI2S           i2s1;
-AudioConnection          patchCord16(volume_r, 0, i2s1, 1);
-AudioConnection          patchCord17(volume_l, 0, i2s1, 0);
+AudioConnection          patchCord17(volume_r, 0, i2s1, 1);
+AudioConnection          patchCord18(volume_l, 0, i2s1, 0);
 AudioControlWM8731master wm8731_1;
 #else
 AudioOutputPT8211        pt8211_1;
@@ -153,8 +155,8 @@ elapsedMillis cpu_mem_millis;
 #endif
 
 // Allocate the delay lines for left and right channels
-short l_delayline[CHORUS_DELAY_LENGTH_BYTES];
-short r_delayline[CHORUS_DELAY_LENGTH_BYTES];
+short l_delayline[CHORUS_DELAY_LENGTH_SAMPLES];
+short r_delayline[CHORUS_DELAY_LENGTH_SAMPLES];
 
 //*************************************************************************************************
 //* SETUP FUNCTION
@@ -226,11 +228,11 @@ void setup()
   Serial.print(audio_block_time_us);
   Serial.println(F("us)"));
 
-  if (!modchorus_r.begin(r_delayline, CHORUS_DELAY_LENGTH_BYTES)) {
+  if (!modchorus_r.begin(r_delayline, CHORUS_DELAY_LENGTH_SAMPLES)) {
     Serial.println(F("AudioEffectModulatedDelay - right channel begin failed"));
     while (1);
   }
-  if (!modchorus_l.begin(l_delayline, CHORUS_DELAY_LENGTH_BYTES)) {
+  if (!modchorus_l.begin(l_delayline, CHORUS_DELAY_LENGTH_SAMPLES)) {
     Serial.println(F("AudioEffectModulatedDelay - left channel begin failed"));
     while (1);
   }
@@ -241,16 +243,15 @@ void setup()
   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(0, 0.0);
-  mixer_l.gain(0, 0.0);
-  mixer_r.gain(1, 0.0);
-  mixer_l.gain(1, 0.0);
-  mixer_r.gain(2, 1.0);
-  mixer_l.gain(2, 1.0);
+  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);
 
   // set master volume
   set_master_volume(master_volume);
diff --git a/config.h b/config.h
index 3fd7f42..312f54e 100644
--- a/config.h
+++ b/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_BYTES (16*AUDIO_BLOCK_SAMPLES)
+#define CHORUS_DELAY_LENGTH_SAMPLES (16*AUDIO_BLOCK_SAMPLES)
 
 //*************************************************************************************************
 //* DEBUG OUTPUT SETTINGS
diff --git a/effect_modulated_delay.cpp b/effect_modulated_delay.cpp
index 284b984..d2b44dd 100644
--- a/effect_modulated_delay.cpp
+++ b/effect_modulated_delay.cpp
@@ -30,7 +30,7 @@
 
 /******************************************************************/
 
-// Based on;      A u d i o E f f e c t C h o r u s
+// Based on;      A u d i o E f f e c t D e l a y
 // Written by Pete (El Supremo) Jan 2014
 // 140529 - change to handle mono stream - change modify() to voices()
 // 140219 - correct storage class (not static)
diff --git a/effect_modulated_delay.h b/effect_modulated_delay.h
index aac2736..833444d 100644
--- a/effect_modulated_delay.h
+++ b/effect_modulated_delay.h
@@ -27,9 +27,9 @@
 #include "Arduino.h"
 #include "AudioStream.h"
 
-/******************************************************************/
+/*************************************************************************/
 
-//                A u d i o E f f e c t C h o r u s
+//                A u d i o E f f e c t M o d u l a t e d D e l a y
 // Written by Pete (El Supremo) Jan 2014
 // 140219 - correct storage class (not static)
 // 190527 - added modulation input handling (by Holger Wirtz)