BIAB has timing adjustments for latency and to coordinate MIDI with RealTracks because everyone's system is different. You can try these two things:

Options, Preferences, MIDI Driver, Latency Adjust

Options, Preferences, Audio, Soft Synth Latency Adjust


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.