TC-Helicon VoiceTone Harmony-G Product Manual page 7

Quick Start
Step 5:
Set the Input Knob fully left then set the Guitar, FX and
Harmony knobs to the 12 O'Clock position.
Input
Tone
Preset
3
#
8
Guitar FX Harmony
Auto
Hall Higher
Room High
E h L
Step 6:
Connect Harmony-G's power adapter to main power
and to the Power Input on Harmony-G. There is no
power switch so plugging it in automatically turns it on.