Create Impulse Tracker .it files from a JSON song datastructure.
See the browser demo here and the node demo in the install section below.
npm i itwriter
Run the node example:
cp node_modules/itwriter/example.js .
node example.js
xmp example.it
Basic usage: const bytebuffer = itwriter(song_structure)
More detailed usage:
import itwriter from "itwriter";
// create a 10ms sinewave sample
const sine = [...(new Array(4410))].map((v, i) => Math.sin(i/10));
const it = itwriter({
"title": "example",
"bpm": 120,
"samples": [{
"name": "sine wave",
"samplerate": 44100,
"channels": [sine]
}],
"patterns": [{
"rows": 32,
"channels": [{
0: {
"note": "C-5",
"instrument": 0,
"vol": "v64",
}
}]
}],
"order": [0],
});
// in Node we can write to disk
import fs from "fs";
fs.writeFileSync("example.it", Buffer.from(it));
// in the browser we can download a blob
document.location.href = URL.createObjectURL(new File([it], "example.it"));See ./example.js for a detailed example of the JSON song structure.
- Currently only patterns and 16-bit mono/stereo samples are supported, not instruments.