This is a really cool unit. I started with a balanced MiniDSP 2x4 board and had Mike Putnam put it in a medium sized pedal case. Specs: -Volume knob -Footswitch (hold down to bypass, hold down to re-engage...not really as useful as I'd hoped--I'd suggest removing and plugging the footswitch hole. The bypass lets no sound through so not terribly useful.) -2 balanced TRS inputs -4 balanced TRS outputs -Line level or Instrument level switch for inputs -mini-USB connector -12v power input -NOTE: Requires a TRS cable for the output channels. TRS to XLR is fine, TRS to TS is fine. A TS cable will not engage. Included is an isolated 12v power supply that will run it with plenty of headroom. I have had mixed results running this thing with less than isolated psu's -- my SupaCharger makes it hum like the dickens. With this 12v included power supply there is ZERO noise. Features -- you can do all kinds of DSP tricks. The plugin I bought for it and will include is the 2-way Advanced. It has many bands of parametric eq, high and low passes of all kinds - see here: http://www.minidsp.com/images/documents/Product Brief- 2way Xover ADV plug-in.pdf This is a super cool unit. I used it for pre-baked eq curves and a butterworth high pass, and for biamping. Possible uses: -Splitting your signal up to route all over a pedalboard. Send highs to one chain, lows to another chain, full range to another chain, then blend them back together with a mixer pedal (e.g. FEA Labs) -Just use it as a nice high pass filter -Program a voicing for sending to limited amps (e.g. add a 1/2 octave boost at 150hz to a fender tone stack amp). -Stick it inside a rack case behind a power amp as a professional up to 4-way crossover without taking up a rack space. -The sky's the limit, really. This thing cost me well over 200 bucks. I'm looking to get out of it for 200 shipped. It's just a plain aluminum box - I'll send you some pics on request.