ok. Here is a the way I do it in Cubase Pro 12. You should be able to do the same thing in Nuendo.
You can do this with any audio file. I did not invent this but I was trying to do the same thing as you. I like the way Pro Tools works for this. SO I asked Greg Ondo on the Cubase live stream on YouTube. He came up with the PLE and I stuck it in a macro so that you can assign it to the key command. To me this is far easier than using lanes and the comp tool.
What I’m doing is using lanes to record audio. Then use the lanes to tracks command to get them in audio tracks. Then create a track called COMP and Cubase will search for the track name. Of course, you can name it anything you want just so the track name is unique. The use the range tool to highlight the section of audio and press the key command.
Above is just an example. I just duplicated a vocal track and colored them different so you can see.
The magic happens in this PLE macro.
