Hi

First, thak you and congratulations on this app! It is great and I'm turning my students on to it.

Regarding transpositions; Perhaps some kind of 'unlocking' would work. I'm not a coder so this may not make any sense. It is the sharps that seem to be the problem for Bb instruments (I haven't looked at Eb transpositions as I play a Bb horn) The II V's can become mixed the way it is now and it is really strange to see a D# or G# major chord.