Spent a lot of time with this now. Just wanted to say for those of you haven't yet, try the DC jumper on the back for the filter INJECT input.
It lets you compare any two signals against each other; the way it is with AC the signal barely does anything except for a bit of syncing for the oscillating filter (to my ears). The filter outputs were very weak with AC on and massive with DC.
Maybe everyone else knew this already! DC should be the default, it's insane to throw two signals in there now.
[...] move the jumper to DC and shoot your note envelopes into INJECT with the sequence going into grind IN.