Check your midi driver. Options/midi driver and see what is set for the input & output midi device.

If you have a DXI envoked, you will probably need to use an ASIO audio driver in Biab to hear it playback in realtime.

You need an Asio driver first, if you have one already, you need to set your AUDIO driver to Asio. Opt/midi audio driver, same place where you select your midi driver. Click the audio settings button there to get to the audio driver area.

Trax