Thanks. Yeah, it's been great working on this. It was always my aim to produce a layout that would allow me to hear any chord in any key instantly and to be able to view it's structure. Something I just couldn't find in a long search of ios apps. Some great ones, but not done how I'd like. I've actually owned MIDI Designer for quite a while but it took this project idea for me to get stuck into it. Glad I did. It kinda escalated into something larger thanks to some cool positive feedback and ideas from a few of the folk on the Audiobus forum. As I get used to the apps features, I'm sure I'll get more ideas for pages. I watched a video on the bounce back feature today. ( That might have saved me 4 hours on the Matrix pages! :) )