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=== record onto same track ==Hold SHIFT and click Record (or SHIFT + R) to record at the end of the selected tracks(s). You cannot record over a mistake or over any existing area in thesame track (known as "punch-in" recording). You will have to recordon a new track underneath to do that, by clicking "Record" or usingthe "R" shortcut.You can delete selected tracks with the Tracks > Remove Trackscommand, for which you could add a keyboard shortcut by clickingAudacity > Preferences: Keyboard