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75 lines
2.1 KiB
Plaintext
75 lines
2.1 KiB
Plaintext
---
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title: Tonal API
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layout: ../../layouts/MainLayout.astro
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---
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import { MiniRepl } from '../../docs/MiniRepl';
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import { JsDoc } from '../../docs/JsDoc';
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# Tonal API
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The Tonal API, uses [tonaljs](https://github.com/tonaljs/tonal) to provide helpers for musical operations.
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### transpose(semitones)
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Transposes all notes to the given number of semitones:
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<MiniRepl client:only="react" tune={`"c2 c3".fast(2).transpose("<0 -2 5 3>".slow(2)).note()`} />
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This method gets really exciting when we use it with a pattern as above.
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Instead of numbers, scientific interval notation can be used as well:
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<MiniRepl client:only="react" tune={`"c2 c3".fast(2).transpose("<1P -2M 4P 3m>".slow(2)).note()`} />
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### scale(name)
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Turns numbers into notes in the scale (zero indexed). Also sets scale for other scale operations, like scaleTranspose.
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<MiniRepl
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client:idle
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tune={`"0 2 4 6 4 2"
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.scale(seq('C2 major', 'C2 minor').slow(2))
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.note()`}
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/>
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Note that the scale root is octaved here. You can also omit the octave, then index zero will default to octave 3.
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All the available scale names can be found [here](https://github.com/tonaljs/tonal/blob/main/packages/scale-type/data.ts).
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### scaleTranspose(steps)
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Transposes notes inside the scale by the number of steps:
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<MiniRepl
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client:idle
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tune={`"-8 [2,4,6]"
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.scale('C4 bebop major')
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.scaleTranspose("<0 -1 -2 -3 -4 -5 -6 -4>")
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.note()`}
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/>
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### voicings(range?)
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Turns chord symbols into voicings, using the smoothest voice leading possible:
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<MiniRepl client:only="react" tune={`stack("<C^7 A7 Dm7 G7>".voicings('lefthand'), "<C3 A2 D3 G2>").note()`} />
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### rootNotes(octave = 2)
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Turns chord symbols into root notes of chords in given octave.
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<MiniRepl client:only="react" tune={`"<C^7 A7b13 Dm7 G7>".rootNotes(3).note()`} />
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Together with layer, struct and voicings, this can be used to create a basic backing track:
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<MiniRepl
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client:idle
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tune={`"<C^7 A7b13 Dm7 G7>".layer(
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x => x.voicings('lefthand').struct("~ x").note(),
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x => x.rootNotes(2).note().s('sawtooth').cutoff(800)
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)`}
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/>
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So far, we've stayed within the browser. [MIDI and OSC](/learn/input-output) are ways to break out of it.
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