Hi Gary
Don't apologise, as I sometimes don't seem to get other concepts. I wish we could have more of this back and forth discussions on this forum.

I will be quite simple here.
An SMF is a "Standard Midi File". In addition to playing syles, I sometimes sing and play while playing a midi(SMF). Let's say my song was recorded in the key of Bb. Maybe my vocal range is such that I want to lower it a half step, so my file is now in the key of A major.

The problem is that I have to play in A to match the key. No, I don't have to. I can raise the the keyboard transpose 2 steps and play it in the key of G, which is easier for me.

If it were not for this independant feature, the midi would go down when I transposed the keyboard. The point is that you can adjust the key of the SMF and the keyboard itself anyway you want.

Bernie