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RE: [analogue-sequencer] sync'n two P3's together?

2006-02-28 by Colin f

> I can't seem to get my two P3's to stay-in-sync, my second one
> (slave P3) always seems to be 1 or 2 steps in front of the master 
> P3 sequencer.
> 
> I have midi-clock set to 'on' on the master-P3 and midi-clock off
> on the slave P3 unit.

I think this may be being caused by a false triggering problem with the
inputs on the PIC chip that converts the P3 DIN sync output to MIDI clock.
Early production P3s used capacitors across the DIN sync lines to remove the
noise I thought was causing mis-triggering, but it seems not to have been a
total fix.
It could be an internal problem with the PICs, since I've never been able to
see any spurious pulses on a scope, and in some cases I was seeing more than
one START or STOP message in a row, which it just isn't possible for the
code to send...
Anyway, I updated the PIC sync code to fix mis-triggering by double sampling
the input pins.
If you find the MIDI clock output on your sync jack is not reliable you can
either get a replacement PIC from me, or just use MIDI clock on one of the
main MIDI outputs.

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

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