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; Triangle wave with a period of 1 second
(define (tri t) (
let ((m (floor-remainder (+ t (/ 1 4)) 1)))
(if (< m 1/2)
(- (* 4 m) 1)
(- 3 (* 4 m)))
))
; Creates a note
(define (note freq start len) (
lambda (t) (
if (or (< t start) (>= t (+ start len)))
0
freq
)
))
; Gets the frequency of a particular pitch
(define (getfreq octave pitch) (
* 55 (ash 1 octave) (expt 2 (/ pitch 13))
))
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