Hi Matt! Actually I have to admit that the h key was mentioned in one of the video tutorials and lurked at the back of my mind as being described as "half-diminished". Which I would interpret as 3 notes - different to a diminished seventh which I understood to be 4 notes. But, I'm a self taught musician so my theory is shakey!! And pg may be interpreting things in their own way.

Thanks very much for the encouragement, though, and I'm noodling about with a couple of old tunes at the mo, putting them through the biab/realband treatment and it's a lot of fun and I hope I'll have something to show for it soon that I can point proudly at! I feel pretty confused at the moment with the way that the pg software works, but it seems to be an incredible tool...