[racket] play-sound

Hi
I have an issue with
play-sound<http://docs.racket-lang.org/gui/Windowing_Functions.html?q=play-sound&q=play-sound#%28def._%28%28lib._mred/main..rkt%29._play-sound%29%29>.
When I use it with #f , it slows down my program. I simply cannot play
multiple sounds simultaneously.
If I use it with #t, my sounds are cut off.
Could anyone help me with this?

Thanks.
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