I am not familiar with Pianoteq software piano, but the first question would be, has this worked before and something changed? Or is this a new setup?

Are you using ASIO drivers for either program? If so, try MME for BIAB.


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.