Hey John,
Thanks for the comments.

I'm not sure I agree with the upside down layout idea, but it would be nice to be able to provide it.

We are working on some backend stuff, so I am not sure when we can get back to working on adding new features to the fretboard trainer. There have been lots of suggestions about it, so hopefully we can batch them all up for a v2.

Thanks for telling us about the D,G,A, C problem. I will put in a bug report about that. We'll try to get it fixed quick.

Jon