This is a board to use the Microchip DSPIC chips (with onboard audioquality DAC and ADCs). The inputs are balanced for modular synthesizer use (-5 to +5 for signals, power rails to +-15 volts).
This board lets you integrate a MicroChip DSPIC chip (a 44-pin SMT DSPIC33FJ128GP804) with the common modular musical synthesizer voltages and input/output impedances.
The full details (they're long!) and example software are on the muffwiggler.com web site as "FM Ogre".