A stereo, 1/4' headphone output has its own level control for private monitoring. You can also plug a guitar or bass directly into channel one's switchable high-impedance input.
You can plug XLR microphones into channels one and two, including condensers thanks to the selectable 48V-phantom power supply. The MultiMix 4 USB FX mixer has four input channels, all of which can accept a 1/4' line input. It outputs line-level analog audio and stereo 16-bit, 44.1/48 kHz digital audio over USB for recording low-noise, CD-quality mixes directly to your Mac or PC. This compact mixer is perfect for using in computer-recording setups, intimate live-sound environments, video-editing and production studios, and portable podcasting setups. MultiMix 4 USB FX is a four-channel desktop mixer with a USB digital audio interface that lets you mix live, in the home studio, and record audio directly to a computer. MultiMix 4 USB Four-Channel USB Mixer - DISCONTINUED