Added Freeverb-Antialias-Filter

MicroDexed.ino

@@ -63,6 +63,8 @@ AudioMixer4                reverb_mixer_r;
 AudioMixer4                reverb_mixer_l;
 AudioEffectFreeverb        freeverb_r;
 AudioEffectFreeverb        freeverb_l;
+AudioFilterBiquad          freeverb_antialias_r;
+AudioFilterBiquad          freeverb_antialias_l;
 #endif
 AudioMixer4                master_mixer_r;
 AudioMixer4                master_mixer_l;
@@ -76,9 +78,16 @@ AudioAnalyzePeak           master_peak_l;
 #if defined(USE_FX)
 AudioConnection          patchCord0(reverb_mixer_r, freeverb_r);
 AudioConnection          patchCord1(reverb_mixer_l, freeverb_l);
+#if defined(REVERB_ANTIALIAS_FRQ)
+AudioConnection          patchCord15(freeverb_r, freeverb_antialias_r);
+AudioConnection          patchCord16(freeverb_l, freeverb_antialias_l);
+AudioConnection          patchCord2(freeverb_antialias_r, 0, master_mixer_r, 3);
+AudioConnection          patchCord3(freeverb_antialias_l, 0, master_mixer_l, 3);
+#else
 AudioConnection          patchCord2(freeverb_r, 0, master_mixer_r, 3);
 AudioConnection          patchCord3(freeverb_l, 0, master_mixer_l, 3);
 #endif
+#endif
 AudioConnection          patchCord4(master_mixer_r, volume_r);
 AudioConnection          patchCord5(master_mixer_l, volume_l);
 AudioConnection          patchCord6(volume_r, 0, stereo2mono, 0);
@@ -378,6 +387,17 @@ void setup()
 #endif
 #endif
 
+#if defined(REVERB_ANTIALIAS_FRQ)
+  freeverb_antialias_r.setLowpass(0, REVERB_ANTIALIAS_FRQ, 0.54);
+  freeverb_antialias_r.setLowpass(1, REVERB_ANTIALIAS_FRQ, 1.3);
+  freeverb_antialias_r.setLowpass(2, REVERB_ANTIALIAS_FRQ, 0.54);
+  freeverb_antialias_r.setLowpass(3, REVERB_ANTIALIAS_FRQ, 1.3);
+  freeverb_antialias_l.setLowpass(0, REVERB_ANTIALIAS_FRQ, 0.54);
+  freeverb_antialias_l.setLowpass(1, REVERB_ANTIALIAS_FRQ, 1.3);
+  freeverb_antialias_l.setLowpass(2, REVERB_ANTIALIAS_FRQ, 0.54);
+  freeverb_antialias_l.setLowpass(3, REVERB_ANTIALIAS_FRQ, 1.3);
+#endif
+
   initial_values_from_eeprom(false);
 
   // start SD card

config.h

@@ -102,6 +102,7 @@
 // FX-CHAIN ENABLE/DISABLE
 #define USE_FX 1
 #define SGTL5000_AUDIO_ENHANCE 1
+#define REVERB_ANTIALIAS_FRQ 7500
 
 //*************************************************************************************************
 //* AUDIO SOFTWARE SETTINGS