The "Route MIDI Thru to default..." -- When it is checked, what you play on your external controller and see on the pianoboard in BB is routed NOT to the DXi synth set for default, but to the older MIDI Output that is selected at the RH side of the MIDI Output window.

If you want to hear it, try selecting the "Microsoft MIDI Synth" there.

If you want to fire one of the VSTi or DXi synths, UNcheck that setting and use ASIO sound drivers with a soundcard buffer set low enough that latency is not a problem.


--Mac