I was wanting to do a song in the key of C and do a dual lead, so when I went to custom harmony and entered the key of C. My first note that I want to change was C, so I went to C in global and made changes and nothing happened. So I played a C on guitar and adjusted C is global and nothing happened. So I went note by note in global to see what note the change was making. When I played a C on guitar and adjusted Eb and change was being made. This was not working so I started adjusting the key of the harmony. When I changed to the key of A, when I play a C and adjusted harmony chord to C all worked fine. When I first got the unit it was not like this. I am thinking an update may have changed this. No matter what Key I picked, should it not change the same note on guitar and in global in customs scales when I change keys. Finishing the song the harmony key is A and the song is in C. If I pick C then it changes the wrong keys. Maybe needs to be fixed in an update.