Check Options - preferences - MIDI device and see what synth is selected in RB.

Select the same one you are using in BiaB.
If you are using a softsynth make sure the 'Reroute all MIDI to DXi synth' is checked and a synth is selected.

After making a change in the MIDI output device make sure to use the 'Move selected device to top' button to make it the default.


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