HI Roy
Sorry my misunderstanding.

The add vst function allows you to browse to where you keep your vst s and ad it to the list of vst that biab can load into one of its slots .
You can then select from the slot pull down menu.
The top slot is the only slot you can load a vsti instrument say a GM synth.
This is the slot used by what you want to be your Default synth
The other 3 are for effects vst
Once loaded in a slot for the track you want you will see the vst gui
The pic below shows a Mini Moog vsti loaded in the top slot.

Mike

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BIAB2021 UltraPlus,AsusN55S1Tbssd, W10/64,Akai EIEpro
Yamaha CVP405,SquireStrat, CoolsoftVMidSynth
Novatation Impulse61 Ctr kbd, Cwalk blab Kontakt

http://mikesmusic.byethost16.com/