To reduce midi jitter a2jmidid is required in combination with jack2's -Xalsarawmidi switch ;). It's said that jack1 nowadays provides a feature to reduce MIDI jitter, so maybe jack2's -Xalsarawmidi switch and a2jmidid aren't required for this purpose anymore. However, a while back only jack2 was able to reduce MIDI jitter, let alone that on my old computer jack1 also was unusable for audio. In short, if somebody is interested in making music, without migrating from one tool that get dropped and replaced in favour of another unfinished alpha tool, the best bet is to use Linux, just for selected parts of an audio production.
