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It is really easy to change behaviour of button in prime.

First, to allow usage of qml file instead and remap , rename file KnownDevices.vfsb to something else

cd /usr/Engine/Content
mv KnownDevices.vfsb KnownDevices.bsfv 

When doing this, we tell prime to use qml files located in /usr/Engine/AssignmentFiles/PresetAssignmentFiles/<product code>/ So on prime go it is JP11.

There are two important file, assignment file & device file. These 2 files mus have the name of the midi sound card of the device.

Here is what we have on PGo :

# amidi -l
Dir Device    Name
IO  hw:0,0,0  PRIME GO Control Surface

So QML files must have the same name.

# ls -l
total 56
-rw-r--r--    1 root     root         41619 Jul 10 22:11 Akai_Pro_AFX_MIDI_1_Assignments.qml
-rw-r--r--    1 root     root          5412 Apr 19  2021 Akai_Pro_AFX_MIDI_1_Device.qml