Thanks, I did miss that, looks nice :) Anyway, I figured my project: It will use only one core (for now). The core will handle all the midi communication, light dimmers will be triacs with digital triggers that will have parallel 8bit interfaces connected to the core on J5, and on J8 will be DOUT module used to select specific trigger. This configuration makes possible use of 128 lights (I'll probably not do more than 20-30, for power problems :) ) As dimmers will be self sustaining (they won't need periodical refresh) latency isn't much of a problem... Now just to design dimmers, and I can start working on this, I'll post here any news -- Gimzo