Ok, but C flat IS found a lot in traditional classical music.
So why leave that out? Those other guys, well they are totally out in left field.....

Actually, you get into some trouble when you try to say C minor as opposed to
Eb major. For example the song "My Funny Valentine" starts off in C minor, but ENDS UP in Eb major. So which key is it in? Both are 3 flats.....

So - if you say 3 flats, no one will argue with that.

The trouble with being a "fine musician" is that is a lot more to music than just
blowing some choruses on a blues. A well-rounded musician also knows THEORY.
Bird (Charlie Parker) for example couldn't read a note, nor could he arrange music on the written page. Danny Elfman is a fine composer, but he has to rely upon others to transcribe his musical ideas.

This business of transposing is a THEORY question. I think the problem is the way the notes are stored. If you store them by MIDI note value, information is lost. If you play midi value 49, that could either be a C sharp or a D flat or even a B double sharp. In other words, enharmonic representations are not stored.

So if I play notes from a keyboard, the software has no way of knowing how some notes are supposed to be notated. If the note agrees with the key signature, no problem there, it just won't have any accidentals.

Where BIAB gets into trouble is: it puts accidentals there that don't belong - So the result is totally incorrect. I have noticed though, that when I put the key back to the original, it's correct again. I tried another experiment - transposing a C scale from C to F sharp. The results were a total disaster.

I'm sorry, but I just don't see how a well-rounded musician could miss something so obvious.....

Wm. S. Sinclair