Originellement posté par AudioTrack
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.
Hello AudioTrack,

Thanks for this suggestion. But I have the same problem when I don't use my Clavinova as an expander and I use a VSTi instead (for example Garritan JABB3): as soon as I play with the MIDI Input Driver enabled, BiaB stutters (sometimes after a few seconds, sometimes after a few dozen seconds).

Of course, I can play without the MIDI Input Driver enabled and enjoy BiaB's arrangements as backing tracks, but of course, I can't record myself in MIDI anymore!

Lazy Bird