For Revoice Pro 4.1 there are two efficient ways of working with Cubase or Nuendo:
Drag and Drop , which is simple to use and fast to set up.
ARA (Audio Random Access), which uses a plug-in to synchronize audio regions between Cubase Pro and Revoice Pro.
Alternatively you can try the VST3 Link plug-in.
Also, a VST3 Revoice Pro Monitoring plug-in is included with Revoice Pro that, once installed, allows you to hear audio playback from Revoice Pro through the DAW's audio outputs. It also lets Revoice Pro optionally lock to the DAW's playback with sample-accurate sync. This lets you check processed audio "in place" with DAW audio and video before you transfer it from Revoice Pro back to the DAW.