DigiTech HARDWIRE HT-2 Owner's Manual page 11

To connect the Tuner to your amp, do the following:
1. If you are not using battery power, connect the optional power supply
to the HT-2's power input.
2. Connect a cable from your instrument's 1/4" jack to the 1/4" Input.
3. Connect the Tuner's THRU output to the input of your amplifier to
hear your guitar while tuning. Connect the Tuner's MUTE output to the
input of your guitar amplifier if you do not want to hear your guitar
while tuning.
Note: Use unbalanced mono instrument cables only.
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