Phantom Power Button; Monitor Knob - Universal Audio Volt 1 Hardware Manual

is usually avoided. To prevent clipping, adjust the gain so only
green and yellow meters light, and the red LED doesn't light.
(3) Vintage Button
Press this button to toggle the Vintage Preamp. The Vintage
Preamp can be used on mic, line, and instrument inputs.
The Vintage Preamp adds a carefully crafted analog tube preamp
emulation, inspired by Universal Audio's all-tube 610 console
preamplifier, to the sound. When the button is lit orange, the
circuit is active.
(4) Instrument Button (INST)
Press this button to toggle the impedance and gain of the line
input to accommodate a Hi-Z instrument, such as an electric
guitar or bass. This button is lit green when the Hi-Z input is
enabled.
Tip: Generally speaking, the INST button should be off when
connecting a line-level source such as a keyboard or sound
module, unless you need more gain.
(5) 48V Phantom Power Button
Press this button to toggle 48V phantom power at the XLR
microphone input. The LED blinks red while phantom power is
activating or powering off. The LED is lit solid red when phantom
power is active.
Phantom power is required by most condenser microphones, but
is usually not required with dynamic microphones or ribbon
microphones (phantom power can damage some ribbon
microphones).
Note: Disable phantom power before you connect or disconnect
the microphone.

(6) Monitor Knob