[LAD] midi beat clock

Paul Davis paul at linuxaudiosystems.com
Sat Feb 20 00:34:31 UTC 2010

On Fri, Feb 19, 2010 at 7:40 PM, m.wolkstein at gmx.de <m.wolkstein at gmx.de> wrote:

> i fond out that linux audio apps all have other or there own definitions about the quantity of ticks per beat.
> make it sense to find out an accordance about ticks per beat. or is this irrelevant for any syncing. especially i mean here syncing via jack-transport.

its irrelevant for syncing.

MIDI clock defines itself via 24 messages per quarter note. this isn't
enough to provide true sync, because it does not convey the time
signature (meter) of the timeline. thus, to get real sync, both sides
(master & slave) must either be manually set to the same meter, or
they must use some other mechanism to share the meter.

if you make the default assumption, as so much stuff does these days,
that music normally comes in 4/4, then sync will generally work out of
the box. but on a piece in 5/8 or 9/4, let alone with a meter shift
somewhere in the middle, and more work is required.


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