The transposing function is for creating charts for non concert key instruments like most horns. If you had a tenor sax player and you want him to play an exact specific part that's in your Biab song you click on tenor sax in the transpose window. That changes the notation for a tenor sax. You print out the tenor chart and then change the transpose back to concert.

It's when you get interrupted in the middle of this, save the song and forget to change the transpose that will cause you all kinds of grief three months later.

Ask me how I know this...

And yes a good sax player can play in any key just like you should be able to as well. They certainly have their favorites though, usually the flat keys, F, Bb, Eb, Ab and Db. If you have a choice and don't care yourself you'll make them happier if you're in those keys. These are also the jazz keys because of all the legendary jazz horn players.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.