Sorry to revive this, but I have a similar issue with the Matchstick Ch2. I am using firmware 2.82. No matter what guitar, cable, cab/IR, gain level, effects on or off, etc, etc, etc; I use with Matchstick Ch2, I hear a ghost note 4 steps lower than the note I am playing. So, if I play an E on the 9th fret of the G string, I hear the G# on the 6th fret of the D string in the background. I have muted all other strings, taped the strings above the nut and below the bridge. Nothing stops it. I love this amp, but it is unusable like this.
