Empress Effects Phaser - Manual (Page 21)

Direct Control 40 Sending this message overrides all
other digital settings (speed, width,
waveform, mode) and lets you set
the amount of phase shift directly
with MIDI values. Sending a value of
zero would correspond to minimum
phase shift and 127 the maximum.
This mode would allow you to draw
your own waveforms in a digital
audio workstation and send them to
the phaser.
Exit Direct Control 50 Sending this message with any value
will cause the pedal to exit direct
control.
MIDI Clock Listener 51 Sending a value of 0 causes the pedal
to ignore MIDI Clock messages.
Sending a value of 127 causes the
pedal to listen for MIDI Clock
messages.
By default, the pedal listens for MIDI
Clock messages.