BIAB doesn't and shouldn't have to be all things to all people.
I'd go further than that ... there are literally hundreds of synthesizers out there, each with dozens of parameters that can be tweaked either to get a specific sound, or to get morphing sounds.
I cannot see any way that an application like BiaB could, or should, sensibly even try to replicate the
countless, tending towards infinity, sounds and morphs that can be produced. It would, IMHO, be crazy even to try.
BiaB will send MIDI to a synthesizer.
Use a synthesizer.