[LAU] jackd without MIDI

Paul Davis paul at linuxaudiosystems.com
Tue Nov 17 15:13:23 UTC 2015

On Tue, Nov 17, 2015 at 10:03 AM, Chris Caudle <chris at chriscaudle.org>

> On Mon, November 16, 2015 9:19 pm, jonetsu at teksavvy.com wrote:
> >   "You're probably asking Jack to handle midi devices, too, which
> >   doesn't work. Please deactivate MIDI in Jack's preferences and
> >   try again. We recommend using jack over alsa alone, as the
> >   performance and stability is way better when using jack."
> Does the ALSA API allow one software to use the audio interface
> exclusively, while also allowing a different application to use MIDI on
> the same physical device?

ALSA considers PCM and MIDI devices on the same "card" to be entirely
independent. So .... yes.

> That is the only way I can see those instructions making sense, as saying
> use JACK for audio, and access the ALSA MIDI directly from Bitwig.
> Is that even possible, or once a device interface is claimed for exclusive
> access by JACK does that mean both audio and MIDI access for that device
> are locked to jackd?

If JACK (or any other app) uses ALSA RAW MIDI, then the device access is
exclusive. ALSA Sequencer MIDI implies shared access.
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