Just passing by and I thought I'd give you a quick, low tech opinion. You would do yourself a real favor if you worked out the phrases you want to get a handle on * by ear * in all twelve keys rather than have BIAB transpose them for you. They'll stay with you longer and increase your facility on your instrument.

Thats guaranteed.

Of course its a bit more work but then you get out of practice what you put into it. Guys that can really play know all about this.

Good luck.