Analogue-sequencer

--- In analogue-sequencer@yahoogroups.com, "Colin f" <colin@c...> wrote:
> > I was given one of these 
> > http://www3.sympatico.ca/sales_emblab/about.htm dyn
> > sync to midi converters & ive been trying to drive the p3 
> > from my tr808.
> > The timing is off though (p3 drifts and resets occassionally) 
> > & it only
> > works on tbase 32 setting on the p3 when driven by the 4 bar 
> > pre-scale on
> > the 808.
> > Is most likely just a ropey converter, 808 probs or am i 
> > missing something?
> 
> P3 will sync to midi clock no problem. Midi clock runs at 24 pulses per
> quarter note (really clock bytes rather than pulses), and Roland DIN
sync
> runs at 24 ppqn, so a good DIN sync to midi clock convertor is
fairly simple
> to put together - you just watch for a pulse, and send a clock byte
when one
> arrives. Send a start byte when the RUN line goes high, and a stop
when it
> goes low.
> I make a PIC-based DIN to midi to DIN sync convertor myself, and
test them
> with my 808 driving my P3, and I know for sure that works.
> The need to use a higher than normal tbase setting on P3 suggests
you may
> have the patterns on your 808 scaled at a different timebase than
you think.
> 
> Have you tried syncing the 808 from the P3 DIN output ?
> The 808 can be quite fussy about the timing of DIN sync signals.
> I've actually been working on this a lot recently, moreso on the 303's
> internal sync signals, but the clock circuitry on the 303 is
identical to
> the 808. I've been perfecting the DIN sync to midi clock conversion
feature
> of my 303 midi interface board so that it can precisely drive my P3, and
> indirectly my 808. I've also made some improvements to the P3 DIN sync
> output - sometimes the 808 needs a little time to realise the RUN
line has
> gone high before it sees the first clock pulse. The 303 is the same,
though
> it seems that sometimes the 303 will jump one tick ahead when it
shouldn't -
> this is causing me occasional problems generating midi clock from
the 303...
> 
> Cheers,
> Colin f

Sussed it - dodgy power supply on the converter. 
Swapped it out & its running lovely.

So should the p3 drift slightly along with the 808 in a musical
fashion? ;)

/m