I am having the same problem. The first instrument track on any song is permanently armed for record and won't disarm. This has only started since I switched keyboard to an M-audio oxygen pro 49. Further more, it only happens after I have set the keyboard to "Studio one DAW mode" and followed these instructions https://inmusicbrands.force.com/maudio/s/article/M-Audio-Oxygen-Pro-Series-Setup-in-Studio-One, to enable the controller section. If I leave it in keyboard only mode (i.e.I don't follow the Mackie controller part of the instructions) then it works fine as a keyboard and the arm button works as expected. Obviously it doesn't integrate with the DAW.
As an experiment I have done the following.
- Set up the keyboard and controller as per those instructions.
- Open a new song in studio one.
- Add two instrument tracks.
- Track one is permanetly armed for record.
- Track two can be armed and disarmed with a click.
- Open the midi monitor and arm track two with a click on the button. It send midi message 90 01 7F to MIDIOUT3 and arms the track.
- Disarm track two, It sends midi message 90 01 00 and the track disarms.Now do the same on track one. Try to disarm it by clicking and it sends
- 90 00 7F to MIDIIN3
- 90 00 00 to MIDIOUT3
- 90 00 7F to MIDIOUT3
It looks like, for the first track only, it disarms and then rearms. I've been using MIDI for only about 3 weeks now so I have no idea how to debug this further. Is that MIDIIN3 message going to the controller and then being looped back to the DAW ?
I've just noticed there is a tiny midi icon at the bottom left of the screen, it opens the midi monitor when you click it. It has two arrows either side of the icon. If I click the ARM/DISARM button on track two the right hand arrow briefly flashes. I assume that indicates an outbound midi message. If I do the same on track one both the in and out arrows flash.
Anyone have any idea what I can try next ?