rsound-fft-draw does not work

[jproy]

There's a type problem there... And the test of rsound-fft-draw is commented in test-draw.rkt

[jproy]

(define n (network () (a <= sine-wave 440) (b <= sine-wave 1320) (c <= sine-wave 17600) (out = (* 0.2 (+ a b c)))))

(signal-play n) (rsound-fft-draw (signal->rsound 2048 n))

GIVES AN ERROR

build-array: contract violation expected a vector, given: 2048 in: the 1st argument of (-> (vectorof Integer) (-> (vectorof Index) any/c) (struct/c Array (vectorof Index) any/c (box/c (or/c #f #t)) (-> any) (-> (vectorof Index) any))) contract from: (/Applications/Racket v6.0.1.11/share/pkgs/math-lib/math/private/array/array-struct.rkt typed-module13) blaming: /rsound/rsound/draw.rkt at: /math-lib/math/private/array/array-struct.rkt:15.2