Soundboxen #5: Fluxamasynth-based musical appliance

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Another standalone Fluxamasynth-based musical appliance: Soundboxen #5 is inspired by Brian Eno’s Music for Airports. Six loops play back slightly out of sync; the loop length is controlled by the listener with six potentiometers. Mounted in a Bakelite enclosure with laser cut veneers. Read more for a short video and the Arduino code.

#include "Fluxamasynth.h"
Fluxamasynth synth;

// Eno's Music for Airports #2: F2 G#2 C3 C#3 D#3 F3 G#3

int tones[6] = { 29, 32, 36, 37, 39, 41 };
int instruments[6] = { 55, 55, 55, 55, 55, 55 };
int tapeLength[6] = { 30, 31, 32, 33, 34, 35  };
int startingPoint[6] = { 0, 1, 2, 3, 4, 5 };
int length[6] = { 100, 110, 120, 130, 140, 150 };
int lengthCount[6] = { 0, 0, 0, 0, 0, 0 };
int tempo[6] = { 1000, 2000, 3000, 4000, 5000, 6000 };
int tempoCount[6] = { 0, 0, 0, 0, 0, 0 };
long int startTime = 0;

void setup() {
  Serial.begin(9600);
  int seed = 0;
  for (int i=0; i<6; i++) {
    seed += analogRead(i);
  }

  randomSeed(seed);
  delay(100);
  for (int i=0; i<6; i++) {
    synth.setChannelVolume(i, 255 );  
    synth.allNotesOff(i);    
    synth.setReverb(i, 5, 64, 0);
    pan(5-i,127/(6*i));
  }
  changeProgram();
  startTime = 0;
}

void changeProgram() {
   for (int i=0; i<6; i++) {
      synth.programChange(0, i,random(127));
   }
}

void loop() {
  if (millis() > (startTime + 100000)) {
    changeProgram();
    startTime = millis();
    Serial.println("changeProgram");
  }
  int ledTempo = 0;
  for (int i=0; i<6; i++) {
    int val = analogRead(i);
    tempo[i] = 5100 - map(val, 0, 1023, 100, 5000); 
    tempoCount[i]++;
    if (tempoCount[i] > tempo[i]) {
      if (lengthCount[i] == 0) {
        synth.noteOn(i, tones[i], 127);
      }
      lengthCount[i]++;
      if (lengthCount[i] > length[i]) {
        synth.noteOff(i, tones[i]);
        lengthCount[i] = 0;
        tempoCount[i] = 0;
      }
    }
 
  }  
  delay(1);
}

void pan(int channel, int value) {
  byte command[3] = { (0xb0 | (channel & 0x0f)), 0x0A, (value) };
  synth.fluxWrite(command, 3);
}

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