MIDI jitter on macos

[cschied]

Describe the bug

I wrote a midi sequencer using jack and jack-midi. On Linux everything works perfectly and midi seems to devoid of any jitter. Running the identical code on macos gives unusable results. I suspect that midi events are sent immediately and not synchronized to the audio samples like on linux.

Environment

jackdmp 1.9.22
macos on macbook air m1
installation through macports, however I ran into the same issue with the binary release.

Steps To Reproduce

I unfortunately do not have a canonical example to reproduce this.
I start jack as follows:
jackd -R -d coreaudio -p 64 -- -d coremidi