Frozen velocity values

You can change the velocity by holding down either the controlling shift key or the or the option and shift key I’m not sure which. You can also change the velocity of all the notes in a group by holding down the shift control and option keys the whole process is a hassle but it works.

Sorry, this was a little garbled because I voice recorded the message. Here is what I see happening to velocity adjustments in Garageband 10.4.9 on my M1 iMac. (1) If you have a single region on a track you can adjust the velocity of a single note. (2) If you add a region to that track you cannot adjust the velocity of a single note in the traditional way. But you can adjust a note’s velocity by holding down the shift/option keys, although fixing on a specific velocity is tricky, but it will hold. (3) If you merge the first and second regions on a track you can adjust note velocity in the traditional way. (4) If you duplicate a second (or third or fourth) region on a single track to a new track, making it the only region on that track, you can adjust a note’s velocity in the traditional way. The recent upgrade of the iMac had not changed the note velocity problem that arose after the previous upgrade.