[afandian]

Thanks! Reading the code again, looks like I was filling up buffer of 256 x 16 bit samples.

I think the issue with looping at arbitrary points was word alignment. You need to give it a whole buffer. So you'd have to do some nasty bit-shifting.

Per other reply, I think doing it live is probably easisest!

Thanks for the recommendation. If I ever get back into this I'll take a look.