[chuck-users] midi clock

Kassen signal.automatique at gmail.com
Fri Apr 21 02:17:56 EDT 2006

On 4/21/06, Perry R Cook <prc at cs.princeton.edu> wrote:
> In the original MIDI, clock was just a one byte
> message that subdivided musical time into either
> 12ths of 24ths of quarter notes.  That, combined
> with MIDI start and stop, allowed drum machines to
> talk to each other and sequencers, etc.  It should
> be easy to implement this using our standard MIDI
> and event framework:

Sure, that would work for me. Wait for one of those messages, store "now",
wait for the next, store the new now. Substract those two, chuck the result
to "dur click" and my example code would run already, in essense. We could
average them out depending on wether long-term smoothness or a fast reaction
to clock modulations would be preferable. It's simple, it's consistent and
syncing to drum machines will open the way for lots of jokes about "crash
cymbals". I like it.

One thing that has me a little woried is that currently incoming MIDI
messages can be depended on to be three bytes. Clock messages aren't so if
we are going to have this then from then on sorting MIDI notes and cc's will
need to be done starting with the first byte because otherwise trying to
build conditions on what msg.data2 or msg.data3 are is going to cause
trouble since they won't be there. This might break existing code. Not the
end of the world and your idea is certainly both more simple and more
consistend then my own proposal.

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