Your samples are clipping, that's what you're hearing.

What you have to do is to add the two of them and then create the average.

destSample = ( sample1 + sample2 ) / 2;


Guido

----- Original Message -----
From: Josh DeBonis
To: gbadev@yahoogroups.com
Sent: Monday, January 26, 2004 8:56 AM
Subject: [gbadev] Sound mixing


I'm trying to mix 2 sound samples on the GBA. When I
play them individually, they sound great. When I mix
them together, a sound is produced, but it's not
pretty. I am simply adding the values of each sample
together (it is a sample of the amplitude). I have
tried scaling down the amplitudes before I add them,
to prevent clipping, and this does not prevent the
problem. Do I have to do any strange adding because of
twos complement? Anyone know what I might be missing?

Thanks,
Joshua

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