An Arduino NES inspired multichannel sounds generator library.

• the use of progmem for storing melodies has been greatly optimized;
• it's now possible to apply a smooth fading of notes to each track;
• bonus: dynamic led indication for each channel.

Besides, I wrote python script that converts specially prepared midi files to melody arrays. Unfortunately, at the moment the delays have to be selected manually.

Important! Set ticks per beat/PPQ to 960 or use midi file from examples as template.

5 simple rules:

• one note at one time for each track. No overlaps
• minimal note length - 1/32
• two identical notes running in a row on the same channel will sound like one long note
• midi file must be contain 5 tracks
• track with drums must be named "Drums"

I recommend to use multiplatform midi editor Aria Maestosa.

python mididump_v3.py <midi file> -old_method

Copy array from console and insert it to melodies.h

Plug a speaker to pin 3, then init the sound generator in the setup function.

#include "APSG.h"

void setup()
{
  init_SID();
}

Play a 440Hz triangle wave for 1 second, then stop.

triangle.note = N_A4;
delay(1000);
triangle.note = N_NOP;

Play 2 tones at the same time.

squares[0].note = N_A4;
squares[1].note = N_A5;

Set volume for specific channel to maximum.

noise.volume = 15;

Sweep a channel down to low frequency.

sawtooth.sweep_direction = SWEEP_DOWN;
sawtooth.sweep_shift = 1;
sawtooth.sweep_speed = SWEEP_SPEED(8);

There are other examples in the ino file. For instance, a couple of multichannel melodies. Try them out!