Owner`s manual

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Working with an External Effects Loop
Normally, the GR-20 and GK-3 allow you to mix
GR-20 sounds with the clean sound of your
guitar’s standard pickups. The GR-20’s effect-
loop jacks allow you to add in external stomp-
box or rack effects to your guitar sound:
Connect the GR-20’s rear-panel GUITAR OUT jack to your effect, or to the
first effect in your external effects chain.
Connect the output of the effect, or of the last effect in your chain, to
the GR-20. If your effect or effect chain is:
mono—connect its output to the GR-20’s MIX IN R (MONO) jack.
stereo—connect the last device’s left and right outputs to the
GR-20’s MIX IN L and R (MONO) jacks, respectively.
When a plug is inserted into the GUITAR OUT jack, the guitar’s clean
sound is removed from the GR-20’s mix.
You can also use the GUITAR OUT jack to send your clean guitar sound
by itself to its own amp, mixer channel, or recorder track.
Powering Up
Once you’ve made all of your audio connections:
Turn the GR-20’s rear-panel LEVEL knob volume all the way down.
Connect the GR-20’s power adaptor plug to the GR-20’s AC adaptor jack,
and the AC plug on the other end to a grounded AC outlet.
To help avoid accidentally disconnecting the AC adaptor, wrap the
adaptor’s cable around the post above the adaptor jack.
Press the rear-panel POWER button to turn the GR-20 on.
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When you first turn on the GR-20, its display shows:
and then... then...
flashes to show
you’re in Guitar
mode until...
appears: the
number of the
current patch.
By default, the GR-20 is in Guitar mode, where it’s optimized
for use with a guitar. It can also be optimized for a bass. We’ll
discuss switching between Guitar and Bass modes on Page 8.
Turn the LEVEL knob up to set the desired listening level—its normal
setting is halfway up.
Selecting Your Output Type
To get the best sound from the GR-20, set its output type for the device to
which you’ve connected it. Here’s how:
Press the SYSTEM EDIT button repeatedly until the OUTPUT LINE/AMP
indicator lights.
When SYSTEM EDIT is lit, each indicator’s orange label shows what the
indicator signifies. When PATCH EDIT is lit, the white labels apply.
Turn the Number/Value dial to the right of the display to select the
desired output. If you’ve connected the GR-20 to a:
guitar or bass amp—select GA, for “Guitar.”
keyboard amp, mixer, headphones, or recorder—
select Ln for “Line.”
Press EXIT.
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