Playing with rsound

[wanderley...@gmail.com]

I started to playing around with rsound while reading its documentation.  I wrote the following code:

    #lang racket

    (require rsound)
    (require rsound/piano-tones)
    (define (chord . notes)
      (rs-overlay* (map piano-tone notes)))
    (play (rs-overlay (rs-append (chord 60 64 67)
                                 (chord 60 64 67))
                      (rs-append (piano-tone 72)
                                 (piano-tone 72))))

and I was expecting to hear `(piano-tone 72)` on the begin of the two chords.  The second `(piano-tone 72)` starts few milliseconds after the second chord starts.

Can you help me understand why this is happening?

Thanks,

wander

[John Clements]

The problem here is that the piano notes are not all the same duration. Specifically, your chord (chord 60 64 67) is a bit longer:

(rs-frames (chord 60 64 67)) -> 161634 frames
(rs-frames (piano-tone 72)) -> 144000 frames

There are a lot of ways of solving this, including clipping the two sounds to the same length and using the `assemble` function. but here’s one simple way:

(require rsound)
(require rsound/piano-tones)
(define (chord . notes)
(rs-overlay* (map piano-tone notes)))

(play (rs-append (rs-overlay (chord 60 64 67)
(piano-tone 72))
(rs-overlay (chord 60 65 69)
(piano-tone 72))
(rs-overlay (chord 62 67 71)
(piano-tone 74))
(rs-overlay (chord 64 67 72)
(piano-tone 84))))


(that is, put the append on the outside, and the rs-overlays inside it.)

(Also, yes, I made it a little I-IV-V-I instead of the same chord twice.)

John

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[wanderley...@gmail.com]

Thanks!  I will play with clip and assemble.

--

Abraço,
Wanderley Guimarães