Thanks, Erik.

By the way, I did the variable on/off time pwm routine, and it takes me (again) *5* instructions basically per channel to get it working.

Boby, you are more than welcome to present the ideas you have developed so far as to how to go about tackling this coding problem, and I think that many here will be happy to help in terms of nudging you in the right direction, me included! In that case, post your (pseudo) code and ask specific questions. Doing it that way is perfectly acceptable.