Desktop 4-in / 4-out USB audio interface with 2 preamps and class-leading 24-bit / 192 kHz audio conversion
Vintage Mic Preamp mode for recording your voice, guitar, or any instrument with the rich, full sound of an iconic UA tube preamp
Listen in realtime as you record with Direct Monitoring for latency-free recording
Bus-powered and class-compliant for hassle-free set-up with Mac, PC, iPad, and iPhone using the included USB-C to USB-A cable
Studio-quality headphone amplifier for loud, clear monitoring
48V phantom power for condenser microphones
Stylish, rugged construction built to withstand years of use
Connect MIDI controllers, synths, and drum machines through the onboard 1-in / 1-out MIDI connection
Connect your microphones, instruments, or line level sources here. The combo input connectors accept XLR and ¼” (6.35 mm) plugs. 
A microphone is typically connected with an XLR connector, and an instrument or line level signal is connected with a ¼” (6.35 mm) TS or TRS plug. 
Preamp gain and impedance automatically adjusts for line or mic signals, based on whether the plug is XLR or ¼”, along with the state of the INST button. 
Press the INST button to toggle the impedance and gain of the line input to accommodate a Hi-Z instrument, such as an electric guitar or bass. 
Tip: The Vintage Preamp can be used on mic, line, and instrument inputs.
Balanced and unbalanced connections
The line inputs on Volt are balanced when connected with TRS connectors to balanced equipment. 
Use TRS (balanced) audio cables for the best results with balanced audio sources. Balanced equipment uses three conductor wiring (via TRS or XLR connectors) to reduce interference and electrical noise, and to provide better audio quality over longer cable runs. Use TS (unbalanced) cables for instruments that are not balanced, such as an electric guitar or bass, or an unbalanced synth or sound module. TS connections may also be suitable for shorter input cables, where electrical interference noise may not be an issue.
(2) Gain Knobs
These knobs adjust the preamp gain for the microphones, instruments, or line level devices attached to the associated inputs. For optimum gain, rotate the gain knob to adjust the input signal level while monitoring the source that is connected, so the input meters (3) show signal but do not light red.
(3) Input Meters
 The Input Meters show the signal level of the input, which is controlled by the Gain knob. The red input LED lights when the input signal is near 0 dB (clipping). 
Tip: Clipping occurs when the signal is overloaded. When clipping occurs, the top of the waveform is squared off, creating distortion that may be unpleasant. Clipping has creative uses, but is usually avoided. To prevent clipping, adjust the gain so only green and yellow meters light, and the red LED doesn't light. 
(4) Vintage Buttons
Press these buttons to toggle the Vintage Preamps. The Vintage Preamps 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. 
5) Instrument Buttons (INST)
Press these buttons to toggle the impedance and gain of the line inputs to accommodate Hi-Z instruments, such as electric guitar or bass. These buttons are lit green when the Hi-Z inputs are 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. 
(6) 48V Phantom Power Button
Press this button to toggle 48V phantom power at the XLR microphone inputs. The LED blinks red while phantom power is activating or powering off. The LED is lit solid red when phantom power is active. Both XLR inputs receive phantom power when enabled.
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).