[racket] receive data from microphone, wav file's data chunk value represention

thank you so much!
but it crashes every time I use rsound-play
  (require (planet "main.rkt" ("clements" "rsound.plt" 1 10)))

  (rsound-play ding)
=>crashes

on windows xp sp3 DrRacket 5.1.1(lastest)

any advice?

On 23 May 2011 09:58, Greg Hendershott <greghendershott at gmail.com> wrote:
> You may want to look at John Clements' rsound package on PLaneT:
>
> http://planet.plt-scheme.org/display.ss?package=rsound.plt&owner=clements
>
> On Sun, May 22, 2011 at 8:53 PM, 김태윤 <kty1104 at gmail.com> wrote:
>> hello
>>
>> I want to make voice pitch classfying program in scheme
>>
>> for that,
>>
>> I want to know
>>
>> 0x1. how wav file's data chunk value represent lowest and highest and mid point
>>
>> 0000 for lowest, FFFF for highest and 8FFF for mid point?
>>
>> 0x2. how to receive data from microphone?
>>
>> and any advice or suggestion for classyfing voice pitch?
>>
>> thanks alot!
>>
>> if my question is vague, unclear, or need fixing, please let me know
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>