I had been staving off the urge to plunge into Voyager-land for quite sometime, but could resist no longer and got one. I’m totally blown away by this thing – BUT – it has only served to solidify my desires for a proper multi-voice poly add-on for it. I would think that by stripping it down to just what’s needed to generate, say, four voices that complement a Voyager, with minimal necessity for external controls/display, that it could be reasonably affordable. This is basically what the DSI Poly Evolver Rack was. Doing the same for a Voyager would be MASSIVE.
Perhaps that’s what the MF-106M is… 
That isn’t a cheap option, but it is AN option. Voyager is certainly on my eventual list, but I’m going Minibrute, Minitaur, Freqbox. Really considering a CP-251 as well as soon as I can afford it to play all 3 at once. Minibrute Freq to CP-251, other CV to Minitaur, 251 Mult out to Minitaur and Freqbox Freq in. Osc out from Freqbox to Minibrute. 2 osc lines (plus sub-osc and other waveform shapers) on MInibrute and doubles basslines on the Minitaur.