6
CONTROLS and INDICATORS
1/4" INPUT IMPEDANCE (CH1 INPUT)
This pushbutton switch controls the impedance a signal sees when connected to the CH1 INPUT 1/4"
TS jack. In the LINE (out) position, the signal sees a lower impedance, suitable for line-level signals,
including the outputs of keyboards, acoustic guitars with on-board preamps or bass with active
pickups. In the INST - HI-Z (in) position, the signal sees a higher impedance, suitable for instruments
such as an electric guitar.
PHANTOM POWER and +48V LED (CH1 INPUT)
This pushbutton switch controls the application of 48V DC to the CH1 INPUT XLR connector for use
with a microphone requiring phantom voltage. In the OFF (out) position, no phantom power is applied
and the +48V red LED is off. Pushing the button in (ON position) applies phantom power and turns on
the +48V LED.
GAIN and CLIP CH1 LED (CH1 INPUT)
This control adjusts the gain of the CH1 preamp section. Normally you would adjust this so that the
CLIP CH1 LED just comes on during the loudest audio passages coming into CH1.
USB PLAYBACK TO CH2-CH3 (CH2-CH3 INPUT)
This pushbutton switch allows you to mix USB audio coming from your computer with the signals
coming in from CH1, CH2 and CH3. In the OFF (out) position, no USB audio is mixed. Pushing the
button in (ASSIGN position) mixes in USB playback signal. Refer to the section MONITORING
WHAT YOU RECORD for more information. Note that the relative levels of the CH2-CH3 signals is
fixed with respect to the USB signal level.
LEVEL (CH2-CH3 INPUT)
This control adjusts the level of the CH2-CH3 signal (possibly including USB playback audio - see
above) relative to the CH1 signal.
POWER LED
Indicates when the USB Mix is receiving power from the USB connector and is ready to operate.
LEVEL and CLIP = RED / SIGNAL = GREEN LED (MAIN MIX)
This control adjusts the overall level of the mixed signal output to the MAIN MIX OUTPUT jacks and
to the computer through the USB connection. Normally you would adjust this so that the LED is
mostly green and just turns red during the loudest audio passages.
MONITOR PHONES
This control adjusts the audio level going to the MONITOR OUTPUT jack. Note that the monitor
output level is independent of the main mix level setting.
