PLX 500 recording distorted and sped up

Try changing the setting on the PLX-500, it should be on Line and not Phono.

Thanks for the reply.

Just checked the setting it was on Line. Switched it to Phono and back just to be sure and the same problem still happens.

Everything sounds alright through the turntable and speakers it's just the playback through rekordbox once I finish recording. 

I also had my problem, but the solution is simple (and this topic should come in the manual) Florian gave the solution:

"@Florian > Please try the following:

• Remove the USB cable connecting PLX-500 and your computer.
• Open [Control Panel] > [Hardware and sound] > [Sound].
• From the [Sound] tab, select the device selected as [Default Device] and click [Properties].
• From [Advanced] > [Default Format], check the sample rate in 「XXXXX Hz」 and close the [Properties] window.
• Plug the USB cable back to your computer and connect it to PLX-500.
• From [Sound] window > [Recording], select [Line USB AUDIO CODEC] and click [Properties].
• Click [Advanced] > [Default Format] and select the same sample rate value [XXXXX Hz] as you checked in the above ④. Then, click [OK] and close the window.
  Please make sure not to select anything which includes [1 channel].
• Close the [Sound] window and record the playback on rekordbox.

(Antonio): Important note: it is also necessary to put the correct sampling frequency here (Recordbox):

Brilliant post, this worked for me, thanks so much for taking the time to post this, was getting so frustrated prior to finding this and would never have thought of looking or knowing how to do this on my laptop!