Fun with sum/difference processing!
Sound wise it ends up being somewhat akin to the more common 4 channel arrangement of a Mid/Side pair + a spaced L/R pair mixed together.
I originally did that as a playback work around for the lack of panning control on the R44, where channels 1 & 3 are always routed Left and channels 2 and 3 always routed Right. Only way I could get channel 1 or 3 panned to center was to turn on Mid/Side decoding, which assigns those channels as "Mid". The additional pseudo-stereo aspects of the rearward-facing Back channel acting as Side-channel was secondary and sort of came along for the ride after the primary goal of getting the forward facing center microphone channel panned to center had been achieved. Thankfully it proved useful and attractive despite the asymmetric low frequency reinforcement/cancellation. Taking it one step further by routing the rear-facing channel left and right but with a symmetric polarity-inverted phase relationship, achieved by way of that VST plugin, avoids all the asymmetric reinforcement/cancellation stuff.
