[sdiy] Techniques for Multiplying MIDI Clock frequency?

Pete Hartman pete.hartman at gmail.com
Sat Dec 18 21:53:24 CET 2021

On Sat, Dec 18, 2021 at 2:15 PM Benjamin Tremblay via Synth-diy <
synth-diy at synth-diy.org> wrote:

> 2) I wish I understood the theory of clock multipliers. I have seen code
> that measures the period between clock pulses and dead reckons the
> double-time pulse as an average of the recent periods. But why? Why can’t I
> just fire another extra HIGH-LOW pulse whenever I get a MIDI clock event?
> Why does timing of the extra ticks matter?  I’m assuming 48 PPQ divides the
> clock down to individual sequencer steps on the KPR-77. As long as the
> divided clock is coming in on the beat, what does it matter if some of the
> synthetic pulses are a little off? (They’re just shadows of the main tempo
> clock). It’s not like the KPR-77 is inferring something or trying to
> calculate BPM from the external clock… So… Anyway I just wish I knew what I
> was aiming for, and then maybe I could hit the target.

One suspects that most people are trying to write a general purpose
converter.  E.g. you could run those 48ppq out to some other module, like
an analog sequencer, and it would keep time.  I'm not familiar with the
KPR-77, but I'm also slightly puzzled by the idea that some piece of gear
would require 48PPQN but not care about the timing of half of the pulses.

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