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Controls and Functions
17. MAIN L/R knob/MUTE switch
Use the knob to adjust the volume of audio signal sent to the powered speakers or a powered amplifier
connected to the MAIN OUTPUT jacks (balanced / unbalanced). MUTE: Press to mute all audio output
to the MAIN OUTPUT jacks. (You can still hear the master mix audio in connected headphones through
PHONES).
18. Input level knobs
Set the volume so it's balanced between each channel i.e. no source is overpowering the others:
• Adjust the volume of the guitar input or other mono source connected to CH2 INST.
• Adjust the volume of the keyboard input or other stereo or mono source connected to CH3-CH4.
• Adjust the volume of the computer input via the USB PLAYBACK terminal.
Note: The sound input from the computer via the USB 2.0 terminal can only insert into the
mixer audio before the PHONES and MAIN L/R output volume level control knobs. See mixer
block diagram (Figure 4)
19. USB TO COMPUTER (USB 2.0 Terminal)
This terminal allows you to connect a computer to the mixer, in effect making the mixer function like an
external USB sound card. When connected, the computer will supply power to the mixer, and also allow
audio to be sent between the computer and the mixer (USB PLAYBACK). The USB PLAYBACK input
cannot be sent back to the computer for recording i.e. this mixer does not have LOOP-BACK feature!
But it does take the sum of the analogue channel mix audio (Left and Right) back via the USB 2.0
terminal to the computer, where it can be recorded on compatible audio software. Each input control
(CH1-4) on the mixer sets that channel's volume in the sum of channels mix that is then uploaded to
the PC via the USB Interface.
Caution: Do not connect any device to the USB 2.0 terminal that is not a personal computer
or tablet. Please read the safety precautions for the USB power adapter or USB mobile
battery that you are using. Use a power source and cable that can supply power via a USB
male type B plug based on the following USB standards; Output Voltage: 4.8V to 5.2V and
Output Current: 0.5A or greater.
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