Offizieller Kommentar
You can indeed toggle between then while Serato is open, simply open the DJM-S9 Setting Utility window in the background, select the FX BANK tab, then click the BANK A or BANK B button to change it, otherwise the BEAT FX will remain the same when pressing SHIFT + < or SHIFT + >.
The numbers in the HP / LP are for the resonance, not for any change in the frequency itself; the frequency is what changes on the sweep with the beat.