I played with it a bit more. When the song is in C, I can hear the F chord pretty much all the way through the song. I changed it back to Key of D, & when it then hits the G chord, sometimes it goes mute & it shows on the meters.. When I change it to the key of A, it's not perfect, but I can hear the D chord but when I go back to the Key of D, it starts missing the G chord again.. maybe little Gremlins????