Recording without a controller

I am using Rekordbox 6.6.5. Seen some posts but I didn't find the answers were clear enough.

Context: I am trying to record some of my existing tracks with minor edits (tempo and key changes). 

Am I able to do this without a controller?

Export Mode: The record button is greyed out.

Performance Mode: Record button works but no file gets saved after stopping the recording.

Thanks in advance.