Hmm, I think that its always been like that…
From what I’ve observed it seems that when a plugin is bypassed then the plugin (or Cubase) keeps the portion of audio which it was processing when bypassed, and then when enabled again it plays that old piece of audio. For me this has always happened, and its always seemed crazy because it creates a blip of old audio.
But then you say there’s no vocal on the crossover, so perhaps there’s another reason? I’ll be interested in other peoples observations because its always been blippy for me.
A couple of other methods would be to dup the track and split the parts accross the tracks with one pitch correction for each track, then bus this to a group channel with any other individual vox processing.
Or - I tend to prefer not to run pitch correction in realtime because it can vary in performance between successive plays through (when using AutoTune) so I pitch correct using offline processing once I’ve worked out the appropriate settings to fix things in place.