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I'm trying to generate drum sounds out of nothing, in C++. I'm trying to generate sounds such as:

-high hat
-clap
-beats

For example if you make a sine wave with a low frequency, and let its volume exponentially decrease, you get a sort of beat.
If you make white noise and apply an ADSR envelope to it, you get a very bad sounding high-hat like thing.

But those don't sount to well. Does anyone know the ways to get better sounding drum sounds in such ways as those described above?

I've got everything needed to generate various basic wave shapes, apply time domain filters, FFT, apply frequency domain filters, and save it to a .wav file, I just don't know how to use it all in a nice way to get better drum sounds.

try these two articles:

http://www.csounds.com/ezine/autumn1999/synthesis/
and
http://www.csounds.com/ezine/winter2001/synthesis/

they'll get you started

- bram