LinuxMusicians

There are many possibilities under GNU/Linux with all its advantages and disadvantages, so no idea. :-) Read what is in my signature times through - there I tried to collect EVERYTHING because I myself also much not overview / can remember - as well as the advice of other users e.g. here in the foru...

Is a2jmidid installed?
If not install a2jmidid, it will merge ALSA and jack MIDI. (If it is not installed you will only see jack MIDI).

In qjackctl setup:
Setup >> Options > [X] Run script after startup: "sleep 5 && a2jmidid -e &"

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https://github.com/greatest-ape/OctaSine VST2 frequency modulation synthesizer written in Rust. https://raw.githubusercontent.com/greatest-ape/OctaSine/master/images/screenshot-1.png About Four operators with independent parameters such as volume, panning, modulation index, feedback, three differen...

As far as I understand jackd does not send MIDI clock. The host / DAW reliably sends/receives the MIDI clock/messages, not jackd. You need to define one of them (software/hardware sequencer) as master and the other as slave and connect them via qjackctl or the host / DAW virtually. Once this is done...

A warm welcome to you.
Regarding information, read the 2 links in my signature across, there is a lot.
And ask specific questions here, there are many nice people with different knowledge and musical influences who are happy to help if they can and have time.
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tramp wrote: ↑Sat Jun 19, 2021 5:35 am Yes. Jack sync MIDI messages with audio sample position. So audio and MIDI is perfectly synced in jack.

Very good and I, a user, had thought so too. A developer like you, for example, has more in-depth knowledge and because of that can answer confidently and universally provable. Thanks!

Thank you for the AIO Pro test/try.

You - and everyone here - are LM@Thanks!

Hdspconf does not work with the AIO and possibly not for the Pro, for the setting you take the alsamixer. You can also contact the ALSA RME developer (Adrian) directly: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=fbcdf3343bc8a1272092cf6d164516b76505708b , https://gi...

:-) Further testing and possible fault isolations are very good. I have very little idea of the technical background of Linux & MIDI - have also already unsuccessfully tested quite a few possibilities - that's why I opened the 2 threads: RT MIDI >> https://linuxmusicians.com/viewtopic.php?p=9968...

True, the host/DAW reliably sends/receives the MIDI clock/messages, not jackd.
Are the MIDI messages transmitted by jackd with the same timing accuracy (RT) as audio?

Will ALSA/jackd support MIDI 2.0 in the future?

# I am not a developer and know very little technically, hence these questions.

2 questions/wishes regarding jackd MIDI https://www.midi.org/ : 1.) If I understand correctly jackd does not send MIDI clock to external devices. [...] However, well known is as well, that jack-midi never was done for interact with "hardware synthesizers". For hardware midi handling you in...

This is general, possibly useful, information about jackd/Cadence/...: Demystifying JACK – A Beginners Guide to Getting Started with JACK >> https://linuxaudio.github.io/libremusic ... -jack.html.

The best results are probably achieved with raw MIDI. https://www.alsa-project.org/alsa-doc/alsa-lib/rawmidi.html With all its advantages and disadvantages. [...] However, well known is as well, that jack-midi never was done for interact with "hardware synthesizers". For hardware midi hand...

Sharing knowledge is more than desired. With ADAT you can run all 8 inputs / 8 outputs simultaneously, this works 100%. All extensions work 100% reliable, you can use all 18 inputs / 20 outputs at the same time. With MIDI I have the same problem https://linuxmusicians.com/viewtopic.php?p=99715#p9971...