User Manual
The sounds of devices connected to input jacks are distorted
• Conrm that the SIG indicators are not lighting red. If they are lighting, lower their input gains. You can
also turn on.
• Conrm that level meters are not lighting to their highest levels. If a level meter is lighting to its highest
level, lower its fader.
A send effect is not working
• Conrm that the EFX 1/2 RTN is unlit.
• Raise the EFX 1/2 RTN fader, and conrm that the EFX 1/2 RTN level meters are lit.
• Conrm the send amounts of the channels on which you want to use the effect.
There is no sound or output is very quiet from MONITOR OUT A–F
• Conrm the mixes of each output.
• Conrm that the output volume of each output is raised (MONITOR OUT A–F knobs).
• Conrm the settings of the MONITOR OUT A–F switches.
Audio interface
Cannot select or use the device
• Conrm that the is connected to the computer correctly.
• Conrm that is set to OFF on the .
• Quit all the software that is using the , and turn the off and on again.
• Reinstall the driver.
• Connect the directly to a USB port on the computer. Do not connect it through a USB hub.
Sound skips during playback or recording
• If you can adjust the audio buffer size of the software that you are using, increase the buffer size.
• Connect the directly to a USB port on the computer. Do not connect it through a USB hub.
• Turn the automatic sleep function and other computer power saving settings off.
Cannot play or record
• Conrm that the is connected to the computer correctly.
• Conrm that the Sound setting of the computer you are using is set to "ZOOM L-20".
• Conrm that is set for input and output in the software that you are using.
• Conrm that for channels 17/18 and for channels 19/20 are lit red, and that the level meters are
lit .
• Quit all the software that is using the , and disconnect and reconnect the USB cable connected to
the .
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