Swamp sm11 mixer and usb interface the sm11 might be small, but with 3 input channels, main outs, a headphone out and a usb audio interface, this mixer has everything you need to start mixing and recording. The xlr / trs combination input is capable of accepting microphone level, hi-z instrument level (guitar) or even line level signals. The 2/3 mix channel with stereo 1/4" line input allows for connecting to keyboards or other line level instruments. On top of this, the ad/da usb interface allows for simultaneous recording and playback without affecting the recorded signal, making this little mixer the perfect hub for a small computer-based recording setup. mobile or desktop recording whether starting out in the recording game or needing to record on the go, the swamp sm11 provides all the functionality of a 3 channel analog mixer as well as usb soundcard for pc, mac or laptop. All this functionality is bundled into a tiny steel chassis, making the unit a highly convenient desktop or portable recording solution. The mixer is powered via its usb port so there is no need for additional power supply clutter when connected to a usb device. monitor while you record the sm11 also includes a 1/4" / 6.35mm headphone output, which allows you to monitor (hear) yourself whilst recording. This in turn allows you to playback a pre-recorded track while you are recording another over the top. Adjust the playback/monitor ratio easily with the usb playback control, and the output volume with the phones or monitor control, depending on how you're listening.this professional functionality comes at a fraction of the cost with the sm11. Hi-z instrument input channel 1 on the sm11 includes an impedance switch which effectively turns the channel into a high impedance guitar di, allowing guitars to be plugged straight into the mixer without the need for additional di boxes. This means one less piece of equipment to transport and set up! plug-and-play usb interface the usb interface that's built into the swamp sm11 is fully compliant with usb 2.0 specification. It will work with the usb audio device drivers built into windows 98se/me/2000/xp/vista/7/8/10 and apple os9.1/osx computers with native usb support. No special drivers are needed. Features: usb bus powered, no external power supply needed when used with a computer balanced xlr or unbalanced ¼-inch instrument input with switchable impedance switchable low noise +48v phantom power balanced ¼-inch trs inputs for stereo or mono line-level sources ¼-inch trs output jacks work with balanced or unbalanced lines stereo ¼-inch trs headphone jack with independent level control for output monitoring independent controls for both inputs, main output, and headphone monitor led signal/clip indicator dedicated usb playback level control (monitor/main outs and phones only) usb 2.0 compliant usb cable included specifications: input channels xlr balanced / 1/4" unbalanced "combo" jack (ch1 input) 1/4" balanced or unbalanced (ch2-ch3 inputs) output channels 2x 1/4" trs balanced or unbalanced (main mix/monitor outputs) 1x 1/4" trs balanced (stereo phones output) bus 1x stereo (main/monitor output) input channel function ch1 mic/inst(line) gain -14~+40 db; +48v phantom power switch led peak led turns on when the signal reaches +6dbu level impedance switch (mic/hi-z instrument) level knob ch2-ch3 line signal led, -3db level knob usb audio stereo input / stereo output usb audio class 2.0 compliant type b connector windows 10, 8, 7, vista, xp, 2000, me, 98se mac os 10.12 / os x computers with native usb support a/d-d/a sampling frequency: max 48 khz, bit depth: 16-bit level meter 2 point led meter (clip @ +6dbu, sig@-6dbu) phantom power switch selectable, +48v dc chassis type all steel black finish power requirements 5.0v dc @ <500 ma (external) or usb bus powered power consumption max 2.5 w dimensions 41mm x 101mm x 121mm (1.6" x 4.0" x 4.75") weight 0.42kg