Yamaha DTX900 Owner's Manual page 66

Reference
Basic Structure of the DTX900
■
Trigger mode
[SAMPLING] → [F6] REC → Trigger Mode
The Trigger mode is a convenient feature in Sampling that lets you determine how recording is
started—manually or automatically, based on the audio level.
●
Starting recording manually
[SAMPLING] → [F6] REC → Trigger Mode = manual
Regardless of the audio input signal level, sampling starts soon after you press the [F6] START button
in the Sampling Standby display.
●
Starting recording when the input signal exceeds the Trigger Level
[SAMPLING] → [F6] REC → Trigger Mode = level
After pressing the [F6] START button in the Sampling Standby display, sampling starts as soon as a
strong enough audio signal is received. The threshold for this audio-triggered start is called the Trigger
Level (explained in the illustration below).
Sample recording starts here.
Level
A A B B
Sample recording starts here.
Level
A B
As you can see, the higher the Trigger Level setting, the louder the input audio needs to be in order to
start sampling. On the other hand, if the Trigger Level is set too low, a soft noise may be enough to
inadvertently start sampling.
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DTX900 Owner's Manual
Recording
trigger level
C C D D E E
Recording
C D E
trigger level