asked Oct 07 '15 at 18:15 by Reptilespantoso (11)

Ok, so it turns out that, if a DAW sends a timestamp to an USB midi interface, it's MIDI clock output is much tighter (less jitter). See the thread on Gearslutz here:

Does Bitwig send this timestamp, and if not, are there plans to incorporate this into the software?

Yes, Bitwig sends timestamps. I tested with MIDI Monitor according to the instructions on that Gearslutz link (MIDI Monitor in 'Expert mode').

Note: according to that Gearslutz thread this is something that can only work on a Mac, because it's a feature specific to the Mac OS, and the MIDI interface has to also support it. It's not part of the MIDI spec, so the timestamps don't get sent as MIDI messages. The timestamps are specifically for the interface, to help the interface send MIDI with very low jitter.

According to Gearslutz this feature is supported on Edirol UM880, Edirol UM550, Roland UM-ONE mk2 (and presumably in other Roland USB MIDI devices), iConnectivity mio10 (and presumably their other interfaces) and MOTU interfaces. It may be supported in others as well. These are just ones that are mentioned in that thread, it's worth reading through that thread for detail, although it is very long!

It's not something that manufacturers document unfortunately. But you can tell if an interface supports it by the extremely low jitter measurement on the MIDI messages it sends (description in the Gearslutz thread).


answered Nov 18 '19 at 23:57 by stepb (21)

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Asked: Oct 07 '15 at 18:15

Seen: 1,080 times

Last updated: Nov 18 '19 at 23:57