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This is a playground to test code. It runs a full Node.js environment and already has all of npm’s 1,000,000+ packages pre-installed, including jzz-midi-smf. Try it out:
const rkmidi = require("runkit-midi");
const JZZ = require('jzz');
require('jzz-midi-smf')(JZZ);
const smf = new JZZ.MIDI.SMF(0, 96);
const trk = new JZZ.MIDI.SMF.MTrk();
smf.push(trk);
trk.smfBPM(90).ch(0).program(16)
.tick(96).noteOn('C6', 127).tick(96).noteOn('Eb6', 127)
.tick(96).noteOn('G6', 127).tick(96).noteOn('C7', 127)
.tick(192).noteOff('C6').noteOff('Eb6').noteOff('G6')
.noteOff('C7').tick(96).smfEndOfTrack();
rkmidi(smf);
// click the [▶run] button... ↓
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