Windows Error Code 121 (0x79 hex) is a semaphore timeout error. That means a flag was set awaiting some other code to complete, and it didn't complete in time, and the error event was triggered.

I suspect that this might even just be a data looping issue. The MIDI data that BIAB is receiving is being sent back to the MIDI keyboard, which in turn sends it back to BIAB.
Change the MIDI routing to use a VSTi as per Dr Dan's suggestion and see if that changes the status.


BIAB & RB2025 Win.(Audiophile), Sonar Platinum, Cakewalk by Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Kontakt, Focusrite 18i20, KetronSD2, NS40M Monitors, Pioneer Active Monitors, AKG K271 Studio H'phones