Empress Effects Tremolo2 - Manual (Page 3)

Quickstart
Plug your guitar into the lower jack on the right side. Plug your
amplifier into the jack on the left side. Plug a 9-12V
DC
power supply
into the power jack on the left side (2.1mm barrel connector,
negative tip). Set the mode switch to "knob," the waveform switch
to "tube," the depth to half, rate to half, rhythm to 1, and output to
half.
That's your standard tremolo.