Yeah, the inter-channel wiring was definitely one of the trickier parts of E4L... it uses the fact that plugin devices can have more than just a single stereo out pair, as well as multiple inputs. The E4L panners actually have 8 stereo outputs, for a total of 16 channels which supports 3rd-order Ambisonics. There are routing settings for these additional outputs which can be set using Max code, e.g. so outputs 3/4 from an E4L panner go to inputs 3/4 of the E4L Master Bus.

It does get a bit hairy but it works. The routing assignment logic is here in these patchers if you're curious:
https://github.com/EnvelopSound/EnvelopForLive/blob/master/patchers/bus/e4l.bus.send.maxpat
https://github.com/EnvelopSound/EnvelopForLive/blob/master/patchers/live/e4l.live.routing.maxpat

You can see the multi-outs on the E4L panner devices, and the init routine that gets called to set them up to be "invisibly" routed to the E4L Master Bus.

Then on the E4L Master Bus side, there are multiple inputs and some more e4l.bus.receive initialization stuff...

In standalone Max you could just rip all of this fiddly stuff out and either use send~/receive~ or just simply connect the device patch cords directly. This routing stuff is all definitely a bit of a hack (or your more flattering term "black magic") around the fact that Live does not really support multi-channel audio - everything is stereo, so we construct the multi-channel flow ourselves by using extra sets of stereo pairs.

Uh oh!

Running EnvelopForLive inside of Max/MSP directly? #90

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