Task

Output the 8 notes of the C major diatonic scale to the default musical sound device on the system. Specifically, pitch must be tuned to 12-tone equal temperament (12TET) with the modern standard A=440Hz.

These are the notes "C, D, E, F, G, A, B, C(1 octave higher)", or "Do, Re, Mi, Fa, Sol, La, Si/Ti, Do(1 octave higher)" on Fixed do Solfège.

For the purpose of this task, Middle C (in the case of the above tuning, around 261.63 Hz) should be used as the starting note, and any note duration is allowed.

For languages that cannot utilize a sound device, it is permissible to output to a musical score sheet (or midi file), or the task can be omitted.

import "/sound" for Wav
 
var sampleRate = 44100
var duration = 8
var data = List.filled(sampleRate * duration, 0)
var freqs = [261.6, 293.6, 329.6, 349.2, 392.0, 440.0, 493.9, 523.3]
for (j in 0...duration) {
    var freq = freqs[j]
    var omega = 2 * Num.pi * freq
    for (i in 0...sampleRate) {
        var y = (32 * (omega * i / sampleRate).sin).round & 255
        data[i + j * sampleRate] = y
    }
}
Wav.create("musical_scale.wav", data, sampleRate)