long story short , this is your problem… modern computers generate horrible MIDI clock signals, and Live in particular adds even more crappiness to it
the topic of midi sync is massive in general, but my suggestion for anyone using at least 2 sequencer type devices is to have a DEDICATED external midi clock source… as in, not using your computer or one of the devices in question as the master
your mileage may vary, and im sure we will hear plenty of “but im just trying to jam out, man!” and “works good enough for me!” and blah blah so on and so forth
but if you want tight midi sync and dont want to deal with the hassle of correcting recordings, setting up delays, etc. etc. - get a midi clock generator AND a MIDI patchbay (unless the clock source has multiple outs) - then route the clock into the patchbay and then a cable to each device
basically, midi clock should come from a hardware clock generator of some kind, and all sequencers should slave to that… it still wont be atomically accurate (unless you spring for something like an innerclock device or something) but its lightyears better than slaving between devices, and especially from a computer
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