[sdiy] MIDI Clock sync advice

[Peter Pearson]

Wouldn't it just be easier to find an Atari ST and call it a day?

On Sun, Mar 10, 2024 at 9:27 PM brianw <brianw at audiobanshee.com> wrote:

> One thing I forgot to mention is that time stamps allow transport jitter
> to be corrected. So long as the time stamps themselves are not subject to
> jitter, and the largest jitter delay is known, then the sequencer can force
> a fixed latency between input and output. The accurate time stamps (if
> available) can be used to schedule output MIDI at a fixed latency / delay.
> That latency could be 5 ms, 10 ms, or maybe as high as 12 ms (depending
> upon other latency in the signal path), but the musicians will
> automatically adapt to reasonable latency after the jitter is corrected /
> removed.
>
> This is where technology like CoreMIDI and MOTU's MTP are beneficial.
> They're not available everywhere, though.
>
> Brian
>
>
> On Mar 10, 2024, at 6:19 PM, brian wrote:
> > On Mar 10, 2024, at 6:08 AM, Mike Bryant wrote:
> >> High speed USB is 125uS, but in general the cheaper MCUs used in most
> musical instruments still work on lower speed.  But in any case it's still
> prone to an element of jitter which may or may not be a problem.  I'd love
> to find a real drummer accurate to 1mS :-)
> >
> > Accurate and precise are two different aspects of timing measurement.
> You can't just dismiss one or the other arbitrarily. That's true for all
> scientific measurements.
> >
> > When it comes to music, we also have the human ability to correct for
> latency, but not for jitter. So, an accurate drummer might be ahead or
> behind the other musicians, based on where their kit is set up on stage,
> but that timing error is constant if the drummer has a good "feel" - the
> other musicians all subconsciously adapt to the latency.
> >
> > Acceptable latency is 10 ms to 12 ms in the studio. A band playing
> together on a stage experiences delays of 5 ms to 10 ms due to the speed of
> sound. But the feel of a drum beat requires timing down to some smaller
> level to preserve the feel. If the snare is 5 ms behind, it sounds in the
> 'groove.' 7 ms ahead and it has 'snap.' But if the hits are moving around
> by a significant fraction of that, due to jitter, the 'feel' will not be
> consistent. In an October 1987 article from Electronic Musician, Craig
> Anderton quotes Larry Fast as saying that controlling the sound with
> precision under a millisecond makes synthetic drum patterns sound more
> realistic (human).
> >
> > That's not an exact figure - less than a millisecond - but it says to me
> that we should probably aim for an order of magnitude better than what
> people can hear, just to preserve the feel.
>
>
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