[sdiy] MIDI too fast?

grant at musictechnologiesgroup.com grant at musictechnologiesgroup.com
Tue Jun 15 20:34:34 CEST 2010


> My Jupiter 8 with Groove MIDI takes several milliseconds to respond to a
> note on, and misses any rapid note on-then-offs, or off-then-ons shorter
> than that time too.

Do we have any figures for "several"?

I was thinking even a queue would have helped in the JX3P case.  I'm a
big fan of the queue, even if it takes slightly more code/time to
execute rather than try and do everything in the ISR as was all the rave
back then (nothing like calling a huge subroutine from an ISR, to mess
things up). It's possible to give enough priority to emptying the queue
that it doesn't become audible. Certainly an order of magnitude better
than having to pace MIDI events by milliseconds.

Of course having a newer CPU than 1984 helps with that. Writing code for
the original CPU at the original speed is obviously more painful. ;-)

GB




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