the answer is in the reference manual, it's an option, perfect, there are some situations where you don't want your riff to be transposed with the chords.
"Touch Chord Match [On]/[Off] for each pad to turn it on or off.
If the Chord Match parameter is on for the selected pad, the corresponding pad is played back according to the
chord specified in the chord section of the keyboard generated by turning the [ACMP] on, or specified in the LEFT
part of the keyboard generated by turning the on (when the [ACMP] is off)."