I recently installed OS 5 beta, and I've found that ENV 3 and ENV 4 will not control the Filterbank Cutoff (FreqFilter Cutoff) or Filterbank Poles through the Mod Matrix.
This is frustrating as they are possibly the most useful envelopes to control the most useful components of the filterbank.
Is this a bug? or a design characteristic? or is it supposed to work, and I'm doing something wrong?