No. It's a single instance single instrument synth with Biab. But in a DAW that has multiple midi ports (Biab only has one) you can put the SFZ onto separate tracks as separate instances and each one can have a different instrument. That's still not like the Forte Dxi or Coyote Wavetable where you simply select it and hit play.

GM synth choices have been very limited for years because nobody except basic Biab users cares about GM. GM is primarily used over the internet where you send a GM midi file to your friend or you click on a midi link in your browser and it plays using the built in Windows sound.

Bib

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.