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Each pitched instrument has a line of its own. It says what it holds: notes in front of notes, or chords in front of a chords chart.

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Settings

These are set with set at the top of a cell, or on a with for one block. None of them changes the drums.

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octave

octave counts from C: C4 is middle C, and the note below it is B3. Degree i and a numeral’s root are the key’s root in that octave, and the other degrees and numerals count up from there, so under set key A, i is A3 and v is E4. On a with, it gives one instrument its own octave: with octave 2 { bass: notes i---v--- }.

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transpose

transpose moves the sound of every pitched instrument by that many semitones, up or down: its notes, its degrees and its chords. What’s written stays: a chart keeps its chord names and a guitar its diagrams, so a guitar’s shapes under set transpose 4 are a capo at the 4th fret. On a with, it transposes one instrument and not another. A transpose where only drums play is an error.

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Sound

set with an instrument’s name and a sound sets that instrument’s sound: set guitar.electric muted is palm-muted. Only guitar.electric has more than one sound.