Thanks - the more info from various folks with an M1, the better. . I did another test last night with 2.3.9 and again, 5 minutes recording both DT and ST simultaneously in Live was crackle free (M1 Max, Sonoma).
I’ll give 2.7.3 a try today and report back.
EDIT: UPDATE
Ok, so I uninstalled 2.3.9, installed 2.7.3, rebooted, ran my 5-minute test again. With 2.7.3, the crackles (more accurately: periodic clicks/pops) were back. So then I uninstalled 2.7.3, reinstalled 2.3.9, rebooted, and ran the test again. 2.3.9 once again came up clean without issue and so for me, that’s what I’m rolling with. Ok, back to making some music.