MOTU 838 MK3 Firewire Audio Interface, has been partially tested as I could only test on Linux and Windows. As such I will be selling it AS-IS.

Notes from the manufacturer:

The 828mk3 is MOTU's most advanced FireWire audio interface, raising the bar with innovative features, enhanced standard features that remain unique, superb sound, and reliable performance. It provides 10 channels of pristine, 192kHz analog recording and playback, combined with 16 channels of ADAT digital I/O and stereo S/PDIF. Expand your system by connecting additional MOTU FireWire audio interfaces or the 8 pre mic input expander.

The 828mk3 interface is equally well-suited for studio and stage, with or without a computer. As an interface or standalone mixer, it provides 28 separate inputs and 30 separate outputs, including dedicated main outs on XLRs and two front panel headphone outs. This means you can connect all of your studio equipment - microphones, guitars, synths, keyboards, drum machines, and even effects processors. Record, monitor, route, and process all of these live inputs using the professional on-board CueMix FX digital mixer ” with no latency and no processor strain on your computer. Apply hardware DSP-driven compression, EQ, and reverb to every input and output, independent of your host computer. When recording from the mic/guitar inputs, the 828mk3's signal overload protection gives you an extra 12dB of headroom above zero with no digital clipping or harsh artifacts.

When you're done programming the on-board mixing in the studio, you can unplug the MOTU unit from your computer and take it on the road for operation as a standalone mixer with effects. All mixing and effects parameters are adjustable using the front panel, backlit LCD.

The 828mk3 FireWire interface provides cross-platform compatibility and will also work with all of your favorite audio software and host-based effects via WDM/ASIO/Core Audio drivers. You can also use the included AudioDesk workstation software for Mac giving you 24-bit recording/editing and 32-bit mixing/processing/mastering.