I'm trying to set-up my recently purchased SD90 and all is well except... the melody When playing a style it is not in same key as the melody (right hand) The right hand (melody) is about 3 semitones off from the accompaniment style... can't figure why & how to correct. All suggestions welcome... lots of wasted $ if I can't correct. (It's kinda like an out of tune guitar playing in a group).