We have a mobile unit to record live concerts and location sound. Our setup can record independently from the front mixer
Technical specs:
MADI recording system: RME Madiface XT interface. (192ch, 48kHz, 24bit)
RME Micstasy with Octamic XTC preamps
Mac Pro: OS X Yosemite
3,5GHz- 6-Core Intel Xeon E5
32GB RAM