Boss Drive Zone OD-20 Owner's Manual page 4

Making the Connections
Connecting to the Guitar Amp
fig.03
Electric
Guitar
Connecting to an MTR
or Mixer
Simulator)
fig.04
Electric
Guitar
4
Headphones
With a standard guitar amp, it may be a good idea to set all the tone
controls (BASS, MIDDLE, and TREBLE) to their central positions first,
then adjust from there.
MTR
Guitar Amplifier
(with No Internal Guitar Amp
Mixer
AC Adaptor
PSA-series
(option)
AC Adaptor
PSA-series
(option)