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Using the Tuner Function
CUBE-20XL is equipped with a tuner function. In addition to manual
tuning, you can also use it as a chromatic tuner.
When tuning manually, the sound of the guitar will be output from
the speaker and from the RECORDING OUT/PHONES jack. In chromatic
tuner mode, sound will not be output from the speaker nor from the
RECORDING OUT/PHONES jack.
When tuning manually, you can press the [SELECT] switch to activate a
tuning reference tone.

Manual Tuning

Use manual tuning when the strings are substantially out of tune (such
as after changing strings).
In manual tuning mode, you can tune while listening to the sound of
your guitar through the speakers or headphones.
The volume can be adjusted with the JC CLEAN’s [VOLUME] knob.
If you don’t want the sound of your guitar to be output from the
speakers or headphones, set the JC CLEAN’s [VOLUME] knob to 0.
1. Press the [TUNER] switch.
CUBE-20XL enters the Tuner mode and the [TUNER] switch lights up.
2. Use the Type switch to select the string that you want to
tune.
Knob Position Description
6E Open sixth string (E)
5A Open fth string (A)
4D Open fourth string (D)
3G Open third string (G)
2B Open second string (B)
1E Open rst string (E)
*The reference pitch is A=440 Hz. This cannot be changed.
3. Use the JC CLEAN channel’s [VOLUME] knob to adjust the
volume.
4. Play a single note on the open string that you want to tune.
Tune the string until the green indicator lights.
Flat
Lights red Lights redLights green
Sharp
Pitch is correct
*The red indicator ashes if the pitch is substantially out of tune.
*Press the [SELECT] switch, and you’ll hear a reference tone of the
pitch selected by the Type switch. (This is the Tuning Fork function.)
5. When you have nished tuning, press the [TUNER] switch
once again.

Chromatic Tuning

If you press the [TUNER] switch for one full second or more, the
[TUNER] switch ashes and the unit becomes usable as a“chromatic
tuner,” which automatically determines the name ofthe note closest to
the one played.
Once in the Chromatic Tuner mode, no sound is played from the
speaker or the RECORDING OUT/PHONES jack.
1. Press and hold the [TUNER] switch for at least one second.
[TUNER] switch ashes and CUBE-20XL enters the chromatic tuner
mode.
2. Play a single note on the open string that you want to tune.
Tune the string until the green indicator lights.

Using the Tuning Fork Function

When using manual tuning, you can press the [SELECT] switch to
sound a tuning reference tone at the pitch selected by the Type switch.
1. Press the [TUNER] switch.
CUBE-20XL enters the Tuner mode and the [TUNER] switch lights up.
2. Use the Type switch to select the string that you want to
tune.
*The reference pitch is A=440 Hz. This cannot be changed.
3. Use the JC CLEAN channel’s [VOLUME] knob to adjust the
volume.
4. Press the [SELECT] switch.
The reference tone will sound at the pitch of the string selected by the
Type switch.
5. Play a single note on the open string that you want to tune.
Play an open string or a harmonic, and tune your guitar to match the
reference tone.
6. When you have nished tuning, press the [TUNER] switch
once again.