How do I audition the sound of an instrument or plugin on a track when using an external MIDI Keyboard?

I have verified that I am getting MIDI into BIAB from my keyboard because I can see the MIDI when viewing the Guitar window.
Also I can record the MIDI onto a MELODY track.

So BIAB *sees* my MIDI keyboard MIDI data. But I just cannot find a way of hearing the sound of the note on the current instrument assigned to any track - whether built in, HQ or a plugin - when I play a note on my keyboard.

Clearly the MIDI is getting into BIAB onto the MELODY track - but i really want to be able to hear the sound the instrument or plugin synth etc when I play notes on the keyboard.

How do i do this ?

MacOS Sequoia, M4 Pro Mac Mini , 64GB RAM 512GB SSD ,
BIAB, Cubase, Ableton, Logic Pro, SCALER 3, GigLad, AnyTune, Synthesizer V Pro,Vienna Ensemble Pro, Audiofuse, Fractal FM3, KOMPLETE 15, StreamDeck, iReal Pro
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