Example program from docs fails

[soegaard]

On OS X the example program below from the docs fails.
The error message is:
s16vector-ref: bad index 88800 for s16vector bounds of 0..88199
DrRacket highlights the form:
(rs-ith/left waveform i)

I attempted this on a 6.7 (standard) and 6.90 (racket7 branch).

#lang racket
 
(require rsound)
 
(define waveform (synth-waveform "vgame" 4))
 
; wrap i around when it goes off the end:
(define (maybe-wrap i)
  (cond [(< i 48000) i]
        [else (- i 48000)]))
 
; a signal that plays from a waveform:
(define loop-sig
  (network (pitch)
    [i = (maybe-wrap (+ (prev i 0) (round pitch)))]
    [out = (rs-ith/left waveform i)]))
 
(signal-play
 (network ()
   [alternator <= square-wave 2]
   [s <= loop-sig (+ (* 200 (inexact->exact alternator)) 400)]
   [out = (* s 0.1)]))

[soegaard]

Just checked. The same error occurs on 7.5.

The example is in this section:

https://docs.racket-lang.org/rsound/index.html#%28part._.Sample_.Code%29