Yamaha DTX-PRO Reference Manual page 105

Practicing with the Training Feature
2. PART MUTE
Part Mute is an exercise which you can mute any or all of the drum parts (such as snare and kick) and the backing parts (non-drum parts)
from a training song. Part Mute can be useful in many ways—for example, for practicing only the snare part of the training song, or for
tightening up your rhythm section skills by practicing only with a bass guitar sound.
Keep in mind that this exercise is not scored.
What you can do during training:
Training song
DRUMS: Drum part in the training song
HH: Hi-hat
SNR: Snare
KICK: Kick
TOM: Tom
CYM: Cymbal
 To select a part to mute:
Use the buttons below "
select a part.
" and " " ([F2] and [F3]) to move the cursor, then use the [–] [+] controllers to
BACKING
BASS: Bass part
OTHER: Parts other than bass
Play sounds
Mute sounds
DTX-PRO DTX-PROX Reference Manual 105