Alesis 4 - Auto Pan Effect and Its Direction

Chapter 3 – Overview of Effects
38 MidiVerb 4 Reference Manual
The Direction parameter determines which direction the panning will start in when
triggered (this has no effect if the Trigger parameter is turned off). You can adjust the
attack threshold of this audio triggering function, and adjust the hold time (how long
the Auto Pan will wait before it can be retriggered). The Direction parameter can be
set to alternate; that is, the Auto Pan will change its start direction with each
succesive trigger.