On 06/01/2018 11:45 PM, Will Godfrey wrote: > On Fri, 1 Jun 2018 22:50:50 +0200 > Robin Gareus <robin@xxxxxxxxxx> wrote: > >> On 06/01/2018 09:00 PM, Will Godfrey wrote: >>> Something just occurred to me. >>> >>> Does anyone know if this is transmitted any faster if going computer to computer >>> rather than between hardware devices. So do you get lower latency? >> >> You have more bandwidth but not usually lower latency. >> >>> Also what about keyboards that work entirely as MIDI over USB connecting to a >>> computer? >> >> Depends on the keyboard. >> >> It seems that may chipsets still use the 31.25kbaud (probably because >> you can get USB to physical MIDI ASIC cheap off the shelf). >> >> You can check with jack_midi_dump (or similar). Elbow press/release >> 30-40 notes on a keyboard and check if most individual note events are >> spaced less than 1ms apart. If they are, then the interface is faster >> than physical MIDI. >> >> ciao, >> robin > > Now why didn't I think of that? > Thanks Robin :) > I just tested with a M-Audio Oxygen 49 (which only has USB MIDI) I've used an A4-book to press/release 14 white keys, recorded it with Ardour. The 14 note-off events span 220 samples (@48kHz, ~4.5ms). So the device has a higher bandwidth than physical MIDI (approx 3 times). I can't say anything about the latency though. All other devices that I have here do have an physical MIDI port (5pin DIN) and are only 31.25 kbaud have ~2.0ms round-trip latency. Cheers! robin PS. note-on events are spread out further because I didn't manage to press the book (or elbow) down accurately enough. _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
