i agree you probably want to add envelopes/lfos if you’re planning to use it as 4 voice - you’ll want to take advantage of the 8 CV inputs on the 4vox. control forge looks awesome but you only get one continuous voltage out of it (not counting the inverted output) so with sport modulator you have 3 envelopes / lfos in total. maybe consider something like quadra / xaoc batumi / malekko ad/lfo?
alternatively if you don’t need all 4 voices each oscillator in 4vox can be set to lfo or one shot mode, so that’s another option (haven’t tried the one shot mode yet, so don’t know how snappy it is…)
also considering you have built in VCAs in 4vox and poltergeist i’d perhaps replace the befaco with a couple of smaller mixers which would give more flexibility when mixing additional sources.
and for a 4 voice you’d probably want more than 1 filter? morpheus looks amazing though, and i will likely get it once it’s out…