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Do you have channel 1, 2 and 3 in use on your Midi sequencer tracks? That might be the reason the xfader is sent to the first free channel, in your case channel 4. If I remember correct it behaves like that in some situations.
I have to say I’ve long given up trying to completely understand all of the OT Midi routing and how one seting effcts another. It’s just way too complex. I mostly just mess with the midi settings by trial and error till something works.
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