On your MIDI controller make sure you are assigning release actions for the REC, STOP, and Undo/Redo commands.
For example, your assignments should look like this:
CC50 REC
Msg1, Action:Press, CC#50, Value 127
Msg2, Action: Release, CC#50, Value 0
CC52 STOP
Msg1, Action: Press, CC#50, Value 127
Msg2, Action: Release, CC#50, Value 0
CC53 Undo/Redo
Msg1, Action: Press, CC#50, Value 127
Msg2, Action: Release, CC#50, Value 0
The reason you must do this is because the H90 is expecting similar behavior to momentary normally open switches.
