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Appendix
1. Troubleshooting
Power does not turn on
Is the power cable connected to an electrical outlet?
Is the rear panel power switch turned on?
No sound
Is the ZERO4 powered-on? Are the connected devices
powered-on?
Are the channel faders or the MONITOR LEVEL knob
turned down?
Is the volume level of the channel turned down?
Is the FX IN/MUTE switch set to MUTE?
Is the GAIN knob raised to an appropriate level?
After connecting a device to an input jack, did you as-
sign it correctly to the mixer channel?
Use the INPUT SELECTOR knobs to input the desired source into each
mixer channel.
Make sure that audio is being input.
Use the level meter to verify that audio is being received into each
mixer channel.
Could you have selected a MIDI controller setting as the
input selection?
Use the INPUT SELECTOR knob to select an input jack.
Excessive noise or distortion
Is the GAIN knob set appropriately?
The sound will be distorted if the GAIN knob is set too high, and there
will be excessive noise if it is set too low.
To obtain the best sound quality, the GAIN knobs for the GUITAR,
MIC, and INPUT 1–INPUT 4 jacks should be adjusted as high as pos-
sible without allowing the GAIN knob to light red.
Are you be using an effect?
Some of the effects intentionally add distortion or noise. Check
whether distortion or noise occurs even if you’re not using an effect.
If the sound is distorting at the EQ, make the following
adjustment.
Adjust the gain value of the EQ.
MIDI
MIDI sequencer will not synchronize / MIDI control does not work
Are the MIDI cables connected correctly?
Could a MIDI cable be broken?
Are the synchronization-related settings of your MIDI
sequencer correct?
Refer to the owner’s manual for your MIDI sequencer.
Can’t control via MIDI
Is the device receiving the control change set to receive
MIDI channels 1–16?
Crossfader or MIDI controller operates incorrectly
You may be able to solve the problem by returning the
system to the factory-set condition.
To return the system to the factory settings, hold down the following
buttons while you turn on the power.
While holding down the SPLIT button and the GATEPLAY button,
turn on the power.
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