One workaround would be to set harmony two to be a 6th instead the correct triad tone of the fifth (so that it matches the harmony man’s “triad” voicing) and use a hot switch on the expression pedal input to change it to the fifth. That way you always get the correct third and can change it to the fifth for the root note with a simple tap – or any note within the scale for that matter. You then get actually more functionality (minus the chord auto sensing)
