Hi,

> You can see, it uses only 3 channels, no SFX or sophisticated envelope/shaping
No, *I* can definitely not see (or hear) it. I know nothing about composing music of any kind so I'll take your word for it ;-)

Are you using interrupt on the main CPU already and if so is it DT-INTS?

The code should run on a 16F877 at 20MHz but it'll absorb a fair bit of the available CPU cycles meaning everthing else will run slow(ish). I'll get some data on it when I get a chance to work on it again. The 12F1840 has an internal 32MHz oscillator - that should work pretty well.

/Henrik.