Does the voice randomization modulator only work on certain parameters? When I attach it to pitch, it randomizes the pitch as I would expect it to. But when I attach it to say, the delay effect time, there is no randomization.
The FX processors are monophonic.
Voice Randomization (VR) creates a pseudo-random SEQUENCE whose number of steps is determined by the number of POLYPHONIC voices set on the Voice Page, and it only works in the Polyphonic Area. Each time a key is pressed the sequence advances to the next step. e. g. if the number of voices is set to 3, then the sequence will consists of 3 steps with 3 "fixed" values, and it will cycle through these steps.
If you want to create a NEW random value every time a key is pressed (not a pseudo-random sequence), use a Random LFO with it's Play Mode set to 1shot, and Amp Jitter set to 100%. This works on both the Polyphonic Area and Monophonic Area.
Random LFO with it's Play Mode set to 1shot, and Amp Jitter set to 100%, is basically the equivalent of TrR (Trigger Random) modulation source in Massive.