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Good catch. I'm glad you got it squared alright :)

Take note that JACK-MIDI and ALSA-MIDI (aka ALSA sequencer) are two alternative MIDI transport and inter-application connectivity solutions, each one with its own merits, pros and cons. In my watch, I don't compare each as one being superior to the other, or vice-versa. JACK-MIDI is indeed appointed to have sample-accurate MIDI event transport and thus more resilient to jitter. However that is only true and seen from their respective clients. If all you have are JACK-MIDI clients and one external MIDI I/O interface to outboard hardware (eg. MIDI keyboard controller), the best approach wrt. minimal jitter, is in using the "raw" driver.

Cheers