This is how to play a record backwards in real time.
You will need:
1: A turntable, preferably a Technics 1200/1210 with a regular removable headshell & a Stanton 500 AL or equivalent (I use a Pickering NP/AC) heavy duty stylus.
2: An aerosol can lid.
3: Some Blue Tack
Step 1
Take your aerosol can lid & make a hole in the center just large enough so that the lid fits securely onto the center spindle of the turntable.
Step 2
Take a a small amount of your blue tack & stick it to the upward edge of the aerosol can lid Stick the record you wish to play (backwards) onto the can lid, being careful to center it on the deck at the same time. Make sure you put the side you want to play FACE DOWN on the deck.
Step 3
Clamp the arm into it’s armrest & remove both the headshell & the couterweight. Take the headshell & replace it back on the arm, only UPSIDE DOWN (with the stylus tip pointing upwards).
Step 4
Very carefully move the tone arm UNDER the record & place it in the run off spiral.
Select the correct speed & hit the start button, your record should now be playing backwards

Disclaimer: I cannot be held responsible for any damage to records, deck or stylus brought about by you trying this. Be careful.