no, you don't need a control track since it also works in Technics multi-recording and GM recording. It also does work with easy recording on the 7k, but since Willum is playing track 6 I assume this is not an easy recording:

If track 6 is part 6 real-time record it.
Then copy and paste, track copy, 6 to 11, ok.
Record & edit, realtime record track 11, go to mixer track 11, start, adjust, stop recording.
Copy and paste, track merge, 6 + 11 -> 6, ok.
Now it plays correctly and track 11 will be empty.
Optional step to re-use track 11, record & edit, track assign, track 11 back to part 11.