No longer relegated to the practice room, today’s electronic drums are quite capable on the live stage, but still require some know-how to get the best performance.  To reduce the risk of false triggering, keep your pads away from loud drums and monitors.  Aim the speakers at you, not at your triggers, or use in-ear monitors.  

If the changing the physical position of the pads, monitors, and acoustic drums doesn’t help, then you may need to edit the sensitivity (gain) of the pad.  On some models this can be done from the pad itself.  Other pads require you edit the trigger settings.

If you still have problems, try increasing the ALL Rejection Level (not Rejection Time) that’s usually expressed as a percentage, for any pad that is giving you trouble.  On the DTX-MULTI 12 this is called Global Crosstalk Level.  Use care when adjusting these values.   Although higher values are more effective in preventing crosstalk, they can also make it difficult to play multiple pads at the same time.