How to mix audio samples?

Question

My question is not completely programming-related, but nevertheless I think SO is the right place to ask.

In my program I generate some audio data and save the track

Answer 1

You never said what programming language and platform, however for now I'll assume Windows using C#.

http://www.codeplex.com/naudio

Great open source library that really covers off lots of the stuff you'd encounter during most audio operations.