Empress Effects Phaser - Manual (Page 8)

The Submodes
There are eight submodes available in auto mode.
Submode 1: Phase Shift Follows Envelope
The center of the phase shift changes according to how loud
you play. Hitting the tap switch inverts the phasing motion
for a different tone.
Submode 2: LFO On Envelope
The speed and the center of the phasing effect are both
increased as the input signal grows louder. The tap switch
reverses the changes as the signal grow louder.
Submode 3: Speed Follows Envelope (Sine Waveform)
As the instrument signal gets louder the speed of the
phasing effect increases. The waveform selected for this
mode is a sine wave with a width of 50%. Press the tap
switch to have the speed slow down as the instrument
volume increases.
Try the attack and release set fast so that the envelope
tracking is very tight. The sensitivity controls the fastest
speed that will be reached when the signal is loudest.