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For parallel effects processing, I use a 1-in / 8-out stereo Distribution Amp made by Studio Technologies, then I mix the effects returns via a Rane SM26B. By doing this, I can take a stereo FX feed, divide it without loss across up to eight different rack processors, then I can submix it all back down to another stereo pair for the return via the Rane. Those Rane SM26 units are getting a bit spendy as of late, but they're still a bargain...and there's all sorts of Distro Amps out there, although I would try and find one that's specifically for audio instead of the ubiquitous A/V distros that're out there for cheap (because, as a rule, they ARE cheap consumer-grade junk). But this would let you get away with a pair of send/return modules as being the only thing needed in your build, letting the Distro and the submixer handle the real voodoo!