You're welcome.

I actually think BIAB uses the concept of transposition and key correctly in this case.

I checked my steps before posting so if you didn't get the same result, perhaps I didn't fully understand how you were entering it from the fakebook. The song was indeed supposed to change key when put in concert pitch, and then change key back to the key that is in your Bb fakebook. For example, if it's in the key of F in the Bb fakebook, it would change to Eb in concert pitch, then back to F after applying the transpose command I gave. Yes, clarinet, trumpet or soprano sax are all +2 (as in, two half-steps) and are thus interchangeable. Anyway, I'm glad you got it working.

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.