Motif XS6 XS7 XS8 - Assigning Outputs in Song or Pattern Mode
1) Access [SONG] or [PATTERN] mode
2) Select the song or pattern
3) Press the [MIXING] button
4) Press [EDIT]
5) Press the track number button [1-16] to be edited
6) Press the [F1] VOICE button
7) Press the [SF2] OUTPUT button
8) Use the [CURSOR] to navigate to the "Output Select" parameter
9) Set the "Output Select" parameter assignment as desired
Reference page 235 Motif XS Owner's Manual