This was in my home piano studio about 14 years ago, and was the link between my Mackie mixer and the Mac. It worked perfectly, and has been in storage since then. Included are all the cables shown in the photo, but the wall wart is long gone... fortunately it is just a standard 12-volt DC power brick, center positive (the common one). 

Interfaces and other tech details are shown below, copied from the PDF manual (probably online somewhere, but if not, I'd be happy to email it to the buyer or park it on a server).  

Line Inputs (x2 balanced TRS):

  • Frequency Response: 20Hz to 20kHz, ±0.1dB 􏰀 Dynamic Range: 113dB A-weighted
  • THD+n: <0.002% A-weighted
  • Linearity: ±0.01dB, 0dBFS to 100dBFS
  • Nominal Input Level: +4dBu or –10dBV
  • Input Impedance: 10Kohms
  • Maximum Input Level: +18dBu

Analog Outputs (x2 balanced TRS):

  • Frequency Response: 10Hz to 20kHz, ±0.1dB 􏰀 Dynamic Range: 114dB A-weighted
  • THD+n: <0.002% A-weighted
  • Nominal Output Level: +4dBu or –10dBV
  • Maximum Output Level: +17.2dBu

Headphone Output (x1 stereo mini):

  • Frequency Response: 10Hz to 20kHz, ±0.1dB 􏰀 Dynamic Range: 114dB A-weighted
  • THD+n: <0.002% A-weighted
  • Nominal Output Level: +4dBu or –10dBV
  • Maximum Output Level: +17.2dBu

Hardware

  • Host Interface: 1394a (FireWire)
  • Two balanced 1⁄4” analog inputs with precision 24-bit 128x oversampling analog-to-digital converters
  • Two balanced 1⁄4” analog outputs with high performance 24-bit 128x oversampling digital-to-analog converters
  • One stereo headphone 1/8” analog output with high performance 24-bit 128x oversampling digital-to-analog converters
  • Volume control for headphone output
  • S/PDIF digital I/O with up to 24-bit resolution
  • 24-bit data resolution maintained throughout entire signal path
  • Multiple sample rates from 32kHz to 96kHz
  • Variable sample rate feature lets you select any rate between 32kHz – 96kHz
  • MIDI In/Out