Yamaha DTX-PRO Reference Manual page 108

Practicing with the Training Feature
5. RHYTHM GATE
6. RHYTHM GATE TRIPLET
Rhythm Gate is an exercise for striking pads along with the click at proper timing. Rhythm Gate is an exercise for practicing with sixteenth
notes, while Rhythm Gate Triplets is for triplet notes. When you strike too early or too late, no sound is produced.
What you can do during training:
Difficulty level (gate width); determines the
time range within which sound is produced.
 To change the difficulty level (gate width)
Set a narrower gate width to increase the difficulty level.
Use the [–] [+] controllers to adjust the gate width.
 To change the direction of the timing indicator
The direction of FAST to SLOW can be switched to SLOW to FAST.
Press the button below "FAST/SLOW" ([F3]).
Actual strike
Accurate timing
DTX-PRO DTX-PROX Reference Manual 108