Using Loop Buttons on CDJ2000 to create a [Serato] Quantized Loop...

Ok, so I just got an SL2, have my 2000s connected nicely via Advanced HID, and I just saw a video where Joachim Gerraud used the loop buttons on the 2000 to create a nicely quantized loop in serato.  Mine doesn't seem to do this - it looped but wasn't quantized.  Do I have to do anything in Serato to enable this?

Cheers!