Notes and lengths

In this section we will cover how pitches and timing are written in BeatBax — notes, step lengths, rests, and sustains — before we attach instruments in the next section. The main tokens are:

Token	Meaning
`C4`, `E5`, `G#5`	A note — letter, optional sharp (`#`) or flat (`b`), then octave (scientific pitch). Default length is 1 step.
`C4:4`	Length — hold the same note for 4 steps
`.`	Rest — silence; also cuts the previous note
`_` or `-`	Sustain — keep the previous note sounding for one more step. `C4 _ _ _` is the same as `C4:4`

A step is one timing slot at the song’s bpm:

a bare note (E5) or rest (.) lasts 1 step
an explicit length (C3:8) lasts that many steps

C3:16                 # hold C3 for 16 steps
E5 . G5 C6 . G5 E5 .  # one-step notes and rests
C4 _ _ _              # same duration as C4:4

Continue with Instruments — give Tutorial Groove its pulse, wave, and noise voices.

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