I tried it and it seems to work really well. You need to do the following...
1. Insert the Waves Tune RT effects on the vocal track (stereo or mono as required).
2. Open the Waves Tune RT insert and on the VST3 dropdown select enable MIDI input.
3. Under MIDI input /Keyboard click on Target Pitch.
4. Create a MIDI track with the notes you want the vocal to "sing".
5. Enter the notes you require on the MIDI track (make sure they align with vocals - may take some adjusting to get it just right).
6. Make sure the output of the MIDI track is set to Waves Tune Realtime and set the channel to 1.
Hope this helps,
ZT