Is it possible to code something to mix two or more "tracks" of audio using processing?  Say I have one track which is a 30 second audio file, and a second track that is a 4 second audio file, and I want to mix track 2 into track 1, 11 seconds into track 1.

Is that kind of thing possible?  Any pointers on where to start learning about it?

Thanks very much for listening :-)

Keep well,

MIke.