The University of North Carolina at Pembroke has been doing this since around 2008 or so. Their setup us been up to 3 or 4 Malletkats, 2 DTX's to act as timps and rack/auxiliary, 1-2 synths, bass, guitar, electronic drumset. All ran off of a Yamaha generator. Each performer has their own speaker so you can still see where various sounds are coming from in the ensemble.