Got it. This is opposite the conventional use of transposition, where you enter a song into BIAB from a C fakebook and then use transposition to keep the sound the same pitch but change the notation up a full step for clarinet. But no problem, since BIAB can go backwards just as easily.

Do this:

Determine the key signature of the song in the fakebook. For this example, let's assume your Bb fakebook song is in the key of A. [Note: the first thing anyone should do when entering a fakebook song into BIAB is set the key because the key signature determines the program's correct use of enharmonics.]

In BIAB, set the key to A by clicking on the Key icon (just to the left of the Tempo setting). Use the left-hand column, marked 'Transpose and Set Key Signature'.

Enter the song into BIAB just as you see it in the Bb fakebook.

To make a piano part, change the key to G, again using the left-hand column. [Why G? G is one whole step down from A, to compensate for the fact that a Bb instrument needs notes written one whole step up to match the piano.]

Print the piano part if you need that.

To see it on screen for a Bb instrument, but keep it in the correct concert pitch for the piano, go to Opt., Preferences, Notation. In the Transpose Options pull-down, select anything with +2. You will see choices for Soprano Sax, Trumpet, or Clarinet.

You will now be looking at a part written for a Bb instrument, but playing in concert pitch. You could print that part for clarinet.

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.