I just noticed that VST3 sidechain has a big bug in both Cubase Pro 8.5 and 9.
Create a new empty project, create 5 empty (MONO) tracks, insert VST3 plugin on each track, activate the sidechain icon => erratic display of sidechains in send menu.
I tried with following plugins (be sure you use vst3 versions):
- steinberg compressor
- plugin alliance lindell 254 compressor
- fabfilter pro q2
- fabfilter pro ds
- waves vocal rider
Only steinberg plugins showup in the list correctly. Other vendors is completely erratic: sometimes it shows up and sometimes you have to activate another plugin to have another appear.
Can anyone confirm please ?