Yamaha Motif XF Owner's Manual page 23

If you are recording audio into a computer DAW (like Logic, Cubase, Pro
Tools, Sonar, or Digital Performer), you should have the ability, either in
your DAW's mixer or via plug-in insert, to reverse the stereo image.
Waves' S1 Imager plug-in, for instance, allows you to swap the left and
right sides of a stereo image, and make it narrower or wider.
Speaking of "wider", the spread of the toms and cymbals in all the kits is
more narrowed than your typical GM drumkit, to give a more true
representation of stereo drumkit sound. Again, I know of no one who has
a drumkit that spans 30 feet across from the hi tom to the floor tom.
Kits A001-B016 use the following map assignments which differ from GM
assignments:
C0 = snare brush roll or other percussion sound.
D#1 = snare drag or appropriate snare sound (instead of a handclap)
G#1 = half or shank-ride hi-hat (instead of a foot hi-hat)
A#2 = cymbal choke (instead of a long vibraslap sound)
F3 = tom rim hit (instead of a timbale)
F#3 = tom rim hit (instead of a timbale)
B3 = open foot hat (instead of a referee whistle)
C4 = closed foot hat (instead of a referee whistle)
F#4 = percussion hit (instead of a cuica)
G4 = percussion hit (instead of a cuica)
B4 = rivet cymbal (instead of sleighbells).
C#4 - cymbal roll (mallet)
D4 = gong roll (mallets)
D#4 = gong hit (mallet)
E4 = gong hit (stick)