I just bought a small midi keyboard which lack of a "transpose" button. I connect it to VMPK, then redirect to rosegarden, hope to use VMPK's transpose function.
Then I set VMPK's transpose value = -2, I play in C tune, hope VMPK can generate D tune to rosegarden. It shows as D tune, but it sounds C tune.
I'm not sure about what the logic should be of transpose, I just can't play difficult tune in such a small midi keyboard, and hope to play an easy tune.