Aftertouch ?
This I know for sure . On the Sd1 I can take one sound and apply aftertouch ( editable) .
I can than harmonize that one sound with what Ketron terms as "octaveup" or "octave down" . That gives me the same voice at different octaves , both responding to aftertouch at the same time ! Take a pedal steel guitar and have them play 2 seperate octaves and have assignable aftertouch !
Also the Sd1 allows you to combine 4 sounds at a time and aftertouch can be applied to any one of the 4 combined sounds . You can even "double up" or "double down" the combined sounds called "PROGRAMS" . Very cool ! dano/ketronguy