Alesis D4 Quick Setup Manual page 7

other parameters have already been correctly adjusted. When
you play the pads while no other instruments are being
sounded, all of the hits are triggering and tracking properly.
Now as the band begins and the stage volume is very loud, the
stage starts trembling which causes the drum hardware to
vibrate. At times the tom 1 and the tom 2 pad are triggering
when not being played. This is because the D4 is interpreting the
signals from the stand vibrations as hits. By adjusting the NOISE
parameter the D4 can determine which signals are vibrations
caused by the surrounding noise level, and which signals are
actual hits.
Set the NOISE value.
1. First select the desired trigger to edit, tom 1 in this case.
2. Next place the cursor under the NOISE parameter value.
3. Increase the value to a level that will stop the pad from false
triggering when the strong vibrations occur. If the triggering
is frequent and strong, try starting with an increase of 20 or
more. If the triggering is not as often and is softer in volume,
first try adding 10 to the value, then gradually add more if
necessary.
4. Repeat steps 1 through 3 to correct the problem with the tom
2pad.
5. Finally, return to the Drumset mode by pressing the Drum
Set button. This will protect from the possibility of
accidentally editing your settings.
Nofe: Whenever possible, keep some distance between your
drum kit and the nearest speaker cabinets (especially bass
cabinets), and make sure they are not facing directly at your set
up. Remember that the closer and louder in volume the cabinets
are, the greater the chances are that they will cause false
triggering problems.