(Re)recording a specific part is very clumsy as is, please consider the following …
-
START + END RECORDING
Add a - punch in (start) - punch out (end) - recording option
Something like the Left-Right loop locators -
PLAYBACK TONE
While recording add a tone as substitute of the voice
So you can hear what is sung while you record
So a tone for the voice and a tone for the recording
Thank you for your ear!