Tape player speed

Some of the discussion of recent days has reminded me to ask:
Is there a simple modification which can be made to home and/or automotive
tape players to adjust the speed/pitch? Like an in-line rheostat on the 120
volt plug-in (sorry if my mechanical engineer's ignorance of electrical
stuff is appalling...), or on the 12 volt power input from the car's system?
Mike or anybody: is this possible? It sure would be helpful.
Rich Rittenhouse

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