[sdiy] MIDI too fast?

[ezion]

Know the problem.
Too dense note messages choke most 80s and early 90s synths.
In my experience Yamaha does a bit better than Akai or Roland.
Worst case would be the D50, use of the internal midi delay feature
may cause notes to hang.
Back then Keboard magazine used to include the handling of 'bussy'
midi streams in their test reports.
In general notes may hang or just be a short burp.

Cheers Theo
(not sure if i am back yet, but lurking anyways)


On Tue, Jun 15, 2010 at 5:52 PM,  <grant at musictechnologiesgroup.com> wrote:
> I noticed while playing with some step sequencer MIDI code, that on an
> old 80's synth (JX3P) that you can't send a note-off then immediately
> send the same note-on. The synth just "burp's" the note on.  If I leave
> more than 8ms between them it works fine.
>
> I know from previous skulduggery that the JX3P has a main loop cycle
> time of about 10ms, but this suggests a bug of sorts in the JX3P's MIDI
> implementation or UART code -- clearly the received data is translated
> out of order. The problem is, I don't have a lot of old synth's to
> experiment with and even discovering this was a fluke. I hate adding
> delays because this messes with the "tightness" of the sequence.
>
> Anyway, a monophonic step sequencer by nature requires (obviously) that
> the old note be turned off before the new note comes one. Is there any
> collective wisdom as to what kind of gap might be suitable?  I know
> other people have built various hard and soft sequencers.  If I turn the
> note off half way through the clock cycle then there is no problem, but
> the sound is pretty different.
>
> GB
>
>
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