I don't believe there's an easy way to do this. I tried with a DEQX unit.

The closest would be to set all the speakers as non 96 digital and then send the individual digital signals to the Trinnov (two speakers per cable.) If you need AES rather than SPDIF then you'd have to insert a converter for that (I think; those converters aren't expensive, but you'd be introducing more jitter) ... likely easier to get the Trinnov with SPDIF inputs instead.

If you do this then the 861 would be doing decoding, but, you'd need a volume control in the Trinnov (or after) because the 861 sends digital outs at full volume.

DirecTV HR21, Ram modded Oppo 93, JRiver MC17 on Win7 wi/SSD, Empirical Audio Ultraclock Offramp, 861v6, Bryston 28B SST2 amps, Salk 12" Soundscapes with Dueland caps, RAM modded Audyssey Balanced Pro, Lumagen Radiance, MarantzS4