You can connect two headphones to the device and control volume on both separately. The switch only affects sound on the headphones. The mono switch affects either analog inputs 1+2 or 3+4 depending which stereo pair is selected with the physical switch. The 1-2 / 3-4 switch controls which of the two analog input stereo pairs you hear on the headphones. The Input / Host knob lets you mix computer playback and live signal from selected analog inputs to the headphones (zero latency monitoring). Outputs 3+4 are line level and output 5+6 is SPDIF. The big master fader controls only line outputs 1+2. I didn’t notice any hiss on the mic channels although my home is never quiet and there is always some noise from air conditioning etc. The mic inputs sound ok and you can get quite a lot of gain from them. Four green leds are for signal strength and one red for overload. There are five leds for indicating analog input channel volume. SPDIF seems to automatically sync to incoming digital signal whenever the signal appears at the input. You have volume control only for inputs 1 and 2 and no way to control volume for inputs 3 + 4 and 5+6 (SPDIF). There are two Mic / Line inputs at the front panel (1+2), two line inputs (3+4) and a SPDIF (copper) input at the back (5+6). The device’s six input and six output channels can all be separately recorder and played back. It is buss powered and does not have a power supply.

There is no internal mixer or controls in alsamixer since everything is controlled with physical knobs. The device is USB 2 Audio Class Compliant and fully functional in Linux.

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