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May 10, 2019 15:10
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Play the FF Prelude on your PC speaker, because why not. Requires `beep`.
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| const child_process = require('child_process'); | |
| const beep = (f, l) => { child_process.spawnSync('beep', ['-f', f, '-l', l]); }; | |
| const freq_for_note = (root_freq, step, steps_per_octave = 12) => root_freq * 2**(step/steps_per_octave); | |
| const invert_chord = (steps, steps_per_octave = 12) => steps.slice(1).concat(steps[0] + steps_per_octave); | |
| const rangeTo = n => [... Array(n).keys()]; | |
| const note_length = 60*1000/320; | |
| const root_freq = freq_for_note(440, 3 - 3*12); // C2 derived from A440 | |
| const octaves_per_run = 4; | |
| const maj_run = [0,2,4,7]; | |
| const min_run = [0,2,3,7]; | |
| const maj7_run = [0,4,7,11]; | |
| const runs = [[0, maj_run], [-3, min_run], [0, maj_run] , [-3, min_run], [-7, maj_run], [-5, maj_run], [-4, maj7_run], [-2, maj7_run]]; | |
| runs.forEach(([root_step, run_steps]) => { | |
| const beep_note = (octave, step) => { beep(freq_for_note(root_freq, root_step + step + octave*12), note_length); }; | |
| rangeTo(octaves_per_run).forEach((octave) => { | |
| run_steps.forEach((step) => { | |
| beep_note(octave, step); | |
| }); | |
| }); | |
| rangeTo(octaves_per_run).reverse().forEach((octave) => { | |
| invert_chord(run_steps).reverse().forEach((step) => { | |
| beep_note(octave, step); | |
| }); | |
| }); | |
| }); |
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