[sdiy] Thoughts on MIDI/DIN to analog sequencer synch

[mark verbos]

I think that's right. I have spent hours stressing out about that one myself.
Thing is, when you reset a sequencer it sits at step 1. Then the first pulse
you send steps it to 2. So in the case of my ARP sequencer (which I step from
the trigger out on my TR-909), I am about to start a recording and I hit reset,
then whent the song starts the first note is step 2. This totally pisses me off
and I end up making the whole musical phrase 1 note to the right.

So I raise the question.... why not wire the panel so that the sequencer resets
to the last step insted of the first?

If you are synching to MIDI and/or DIN Grant's way will work really well.

mark

Grant Richter wrote:

> John Blacet makes an excellent MIDI synch chip. I have built up a number of
> experimental units using it. I noticed a minor synch issue and I wanted to
> post a note for comments.
>
> DIN synch runs at 24 pulses per quarter note (ppq). Let's take the case of
> dividing that to 1 pulse per quarter note to run an analog sequencer. We
> need to accumulate 24 pulses before the first 1 ppq signal outputs (because
> of the divider chain).
>
> I think what you really need are three outputs. The first output is a reset
> signal that resets the analog sequencer to the first stage. A second output
> triggers the envelope generators for the actual notes. The third output
> advances the analog sequencer stages.
>
> The output that triggers the envelopes is ORed with a pulse generated by the
> falling edge of the reset line. So when the reset line falls, the first note
> is played on the first stage of the analog sequencer. Then 24 ppq latter,
> the sequencer is advanced to the second stage and that note is played.
>
> I believe this has more correct musical timing and avoids the delay of
> accumulating the first 24 pulses for the output pulse.
>
> Does this seem correct, or am I misunderstanding the way MIDI/DIN synch
> works?
>
> Thank you.

--
mark verbos

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