Analogue-sequencer

> here's what's going on: the clock-only output of the p3 goes to a 
> doepfer pocket controller, which does things to the maq & whatever 
> it's talking to. this goes to a midi through-box, & then to my 
> oldest, most knackered, but up-to-date software-wise maq. 
> the maq's output is merged with another output of the through-box & 
> with my novation x-station controller keyboard. (this last bit of 
> merging happens inside the keyboard). 
> the whole lot then goes back into the p3, while everything else 
> (repeater, supernova, samplers, proteus boxes, ms6's & so forth) is 
> fed from the p3.

Wow.
I'm not entirely sure my brain didn't just go into a feedback loop...

> what I can't figure out is where the spurious F8's are coming from. a 
> normal clock-loop would just chase itself- this is running at the 
> right speed, it's just not starting & stopping when I want it to.

I had some initial problems with the PIC chip doing the sync to MIDI
conversion in the production P3.
There was some false triggering of the PIC inputs, even though there was no
signal at all to be seen on my scope or logic probe.
I fixed this initially by adding capacitors to the input pins.
It's possible this isn't enough on the chip in your unit.
My later fix was to add soft noise reduction on the PIC.
I'll send you a new PIC to try.

Best regards,
Colin Fraser
Sequentix Music Systems Ltd
http://www.sequentix.com