Midi Merge Technique?

[Batz Goodfortune]

Y-ellow Rene 'n' Paul 'n' Y'all.

At 10:17 PM 01/22/00 +0100, Rene Schmitz wrote:
>At 00:12 21.01.00 +1100, Paul Perry wrote:
>>looking on the scope at what comes out of the Korg KMS30 midi to din
>convertor,
>>I can only assume that the midi timing clocks have a pretty wide jitter on
>them 
>>as they come out of Cakewalk on my computer.
>>
>>Has anyone got gear to tell exactly how regular are midi clocks in the real
>>world?
>>
>>paul perry Melbourne Australia
>>
>
>Hi Paul! 
>
>You can also look at the data stream directly on a scope. I've once done it, 
>and found jitter. Also with Cakewalk. I don't know if other applications 
>are any better. 
>
>Bye,
> René

This can't be too bad. Certainly not in a practical sense. And most likely
all software would do it to a certain extent. Anecdotally at least, I've
used CW since version 1-dos and never had a sync problem. And I use
extensive syncing. Both internally and externally. What I did have problem
with was one of the afor mentioned KMS30 Korg sync boxes. A very curious
thing happens at exactly 115BPM. The sync just flakes out all over the
place. We couldn't work out what was going on but we soon leant never to
stripe a tape at 115PBM. 116 was fine. 114 was fine but @115 it went crazy.

And of course there is Jitter and there's Jitter. If you're talking about
the jitter  caused by the UART this is another thing altogether. On the
other hand, the most common cause of sync jitter in a wide sense is BOSH95
it self. It is why sequencer software, until very recently has mostly been
written using 16 bit code. The preemptive multi-tasking under BOSH95 causes
real-time  tasks to flake badly. They have apparently fixed this problem in
BOSH98 where software can specify it's priority. But! It's still a long way
from the claimed real-time streaming which was promised in BOSH95 and still
not delivered in BOSH98. No-one to my knowledge actually uses this because
it still doesn't work. WINK might be different but I'm certainly not game
enough to try it. From all accounts it's a useless bucket of crap.

Anyway, it would seem that a little jitter never hurt anyone. ????

Be absolutely Icebox.

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