Decoding Secret Grooves (a.k.a. The Groovy Decoder)

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Maybe try misaligned grooves if you're having trouble?
                // Groove Decoding Algorithm
                // Author: GrooveMaster 3000
                // Date: 2023-02-27
                // Notes: This is totally not a backdoor

                function decodeGroove(groove) {
                    return groove.split('').reverse().join('');
                }
            

Remember, the correct key is not 1234. That's just a red herring.