Acid Rain
Using my lofi delay object that creates 6 delay lines (octave up, octave down, no octave change plus each of those in reverse) and the glitch delay technique of crossfading between delay lines to jump about in time. This has to be the craziest effect I've ever made!
I've added a sample rate reducer and low pass filter at the end for extra garbled glitchiness. It's currently in Mono.
You need to create the lofi delay library for this sketch to run. Follow the instructions here LINK
A0 = Size (time between potential glitches)
A1 = Lowpass filter
A2 = Density (probability of glitching
A3 = Sample rate
Toggle = Different feedback settings*
Footswitch = Infinite feedback
*Toggle left = always some feedback, footswitch = max feedback and silences input
Toggle middle = usually no feedback, footswitch = max feedback with input still present
Toggle left = usually no feedback, footswitch = max feedback and silences input
#define LED 3
#include <Bounce.h>
#include "effect_lofi_delay.h"
#include <Audio.h>
#include <Wire.h>
#include <SPI.h>
#include <SD.h>
#include <SerialFlash.h>
// GUItool: begin automatically generated code
AudioInputI2S i2s1; //xy=125,163
AudioEffectLofiDelay lofidelay1; //xy=223,379
AudioMixer4 mixer4; //xy=421,152
AudioEffectFade fade6; //xy=437,546
AudioEffectFade fade4; //xy=438,441
AudioEffectFade fade5; //xy=438,496
AudioEffectFade fade3; //xy=439,392
AudioEffectFade fade1; //xy=440,272
AudioEffectFade fade2; //xy=440,327
AudioMixer4 mixer2; //xy=639,473
AudioMixer4 mixer1; //xy=640,384
AudioMixer4 mixer3; //xy=794,414
AudioEffectBitcrusher bitcrusher1; //xy=982,411
AudioFilterBiquad biquad1; //xy=1150,409
AudioOutputI2S i2s2; //xy=1307,406
AudioConnection patchCord1(i2s1, 0, mixer4, 0);
AudioConnection patchCord2(lofidelay1, 0, fade1, 0);
AudioConnection patchCord3(lofidelay1, 1, fade2, 0);
AudioConnection patchCord4(lofidelay1, 2, fade3, 0);
AudioConnection patchCord5(lofidelay1, 3, fade4, 0);
AudioConnection patchCord6(lofidelay1, 4, fade5, 0);
AudioConnection patchCord7(lofidelay1, 5, fade6, 0);
AudioConnection patchCord8(mixer4, lofidelay1);
AudioConnection patchCord9(fade6, 0, mixer2, 1);
AudioConnection patchCord10(fade4, 0, mixer1, 3);
AudioConnection patchCord11(fade5, 0, mixer2, 0);
AudioConnection patchCord12(fade3, 0, mixer1, 2);
AudioConnection patchCord13(fade1, 0, mixer1, 0);
AudioConnection patchCord14(fade2, 0, mixer1, 1);
AudioConnection patchCord15(mixer2, 0, mixer3, 1);
AudioConnection patchCord16(mixer1, 0, mixer3, 0);
AudioConnection patchCord17(mixer3, 0, mixer4, 1);
AudioConnection patchCord18(mixer3, bitcrusher1);
AudioConnection patchCord19(bitcrusher1, biquad1);
AudioConnection patchCord20(biquad1, 0, i2s2, 0);
AudioControlSGTL5000 sgtl5000_1; //xy=880,637
// GUItool: end automatically generated code
Bounce footswitch = Bounce(0, 50); // debounce the footswitch
Bounce D1 = Bounce(1, 50); // debounce the toggle switch
Bounce D2 = Bounce(2, 50); // " " " " " " " " "
// this section includes the function to check the toggle position
bool right;
bool middle;
bool left;
void checkToggle () { // this is our function to check toggle position...
D1.update(); D2.update(); // check digital inputs connected to toggle (can delete I think)
if(digitalRead(1) && !digitalRead(2)) {right = 1; middle = 0; left = 0;} // toggle is right
if(digitalRead(1) && digitalRead(2)) {right = 0; middle = 1; left = 0;} // toggle is in the middle
if(!digitalRead(1) && digitalRead(2)) {right = 0; middle = 0; left = 1;} // toggle is left
}
uint16_t delay_max = 65535; // number of samples at 44100 samples a second
int16_t delay_line[65535] = {};
uint16_t delaytime = 1000;
// glitch variables
void fadeout();
void fadein();
//unsigned int glitchtime = 300;
unsigned int fadetime = 25;
unsigned int density = 50;
unsigned int n_time;
unsigned int sub_time;
unsigned int up_time;
unsigned long currentMillis = millis();
byte whichfade = 0; // 0 is fade in fade1, fade out 2, fade out 3. etc...
byte lastfade = 1;
//crush
uint16_t samplerate;
uint16_t lpf;
float octup;
float octdown;
float feedback;
void setup() {
AudioMemory(40); // the "40" represents how much internal memory (in the Teensy, not the external RAM chip) is allotted for audio recording. It is measured in sample blocks, each providing 2.9ms of audio.
sgtl5000_1.enable(); // this turns on the SGTL5000, which is the audio codec on the audio board
sgtl5000_1.volume(1); // this sets the output volume (it can be between 0 and 1)
sgtl5000_1.inputSelect(AUDIO_INPUT_LINEIN); // selects the audio input, we always use Line In
analogReadResolution(12); // configure the pots to give 12 bit readings
pinMode(0, INPUT_PULLUP); // internal pull-up resistor for footswitch
pinMode(1, INPUT_PULLUP); // internal pull-up resistor for toggle
pinMode(2, INPUT_PULLUP); // internal pull-up resistor for toggle
pinMode(3, OUTPUT); // pin 3 (the LED) is an output;
Serial.begin(9600); // initiate the serial monitor. USB is always 12 Mbit/sec
analogReadAveraging(32);
sgtl5000_1.adcHighPassFilterDisable();
sgtl5000_1.audioPostProcessorEnable();
sgtl5000_1.audioPreProcessorEnable();
sgtl5000_1.autoVolumeEnable();
lofidelay1.acidMode(1);
lofidelay1.begin(delay_line, delay_max);
// output mixers
mixer1.gain(0,1);
mixer1.gain(1,1);
mixer1.gain(2,1);
mixer1.gain(3,1);
mixer2.gain(0,1);
mixer2.gain(1,1);
mixer3.gain(0,1);
mixer3.gain(1,1);
// feedback mixer
mixer4.gain(0,1);
mixer4.gain(1,0);
//initialise delays
sub_time = (analogRead(A0) >> 2) + 50;
n_time = sub_time ;
up_time = sub_time / 2;
lofidelay1.setdelay(0, n_time);
lofidelay1.setdelay(1, n_time);
lofidelay1.setdelay(2, sub_time);
lofidelay1.setdelay(3, sub_time);
lofidelay1.setdelay(4, up_time);
lofidelay1.setdelay(5, up_time);
bitcrusher1.bits(16);
bitcrusher1.sampleRate(44100);
}
void loop() {
//delay / glitch times
sub_time = (analogRead(A0) >> 2) + 50;
n_time = sub_time ;
up_time = sub_time / 2;
if(millis() - currentMillis >= sub_time) // time to glitch
{
density = analogRead(A2);
if(density >= random(4095))
{
digitalWrite(LED, HIGH);
fadeout();
lastfade = whichfade;
while(whichfade == lastfade)
{whichfade = random(6);}
fadein();
}
currentMillis = millis();
}
// crush
samplerate = (analogRead(A3) * 5) + 1000;
bitcrusher1.sampleRate(samplerate);
// filter
lpf = (analogRead(A1) * 2) + 1000 ; // 1000 to ~9000 hz. ("analogRead(A1)" will return values from 0 to 4095
biquad1.setLowpass(0, lpf, 0.7); // q = 0.7
// footswitch
if(!digitalRead(0))
{
checkToggle();
if(left) {mixer4.gain(0,1); mixer4.gain(1,1);} // turn on feedback
if(middle) {mixer4.gain(0,1); mixer4.gain(1,1);}
if(right) {mixer4.gain(0,0); mixer4.gain(1,1);}
}
else
{
checkToggle();
if(left) {mixer4.gain(0,1); mixer4.gain(1,0.8);} // feedback always slightly on if toggle left
else {mixer4.gain(1,0); mixer4.gain(0,1); } // turn off feedback
}
if(millis() - currentMillis >= 20) digitalWrite(LED, LOW); // turn LED off (flashing)
}
// glitch functions
void fadeout ()
{
if(whichfade == 0) {fade1.fadeOut(fadetime); }
if(whichfade == 1) {fade2.fadeOut(fadetime); }
if(whichfade == 2) {fade3.fadeOut(fadetime); }
if(whichfade == 3) {fade4.fadeOut(fadetime); }
if(whichfade == 4) {fade5.fadeOut(fadetime); }
if(whichfade == 5) {fade6.fadeOut(fadetime); }
}
void fadein ()
{
if(whichfade == 0) {fade1.fadeIn(fadetime); lofidelay1.setdelay(0, n_time); }
if(whichfade == 1) {fade2.fadeIn(fadetime); lofidelay1.setdelay(1, n_time); }
if(whichfade == 2) {fade3.fadeIn(fadetime); lofidelay1.setdelay(2, sub_time);}
if(whichfade == 3) {fade4.fadeIn(fadetime); lofidelay1.setdelay(3, sub_time);}
if(whichfade == 4) {fade5.fadeIn(fadetime); lofidelay1.setdelay(4, up_time); }
if(whichfade == 5) {fade6.fadeIn(fadetime); lofidelay1.setdelay(5, up_time); }
}
