Finding the range of HPF and LPF in the delay module

[pcs800]

In the delay module, there are HPF and LPF parameters which do not show in the module itself. How do I find the range for these so I can use a knob to adjust them?

[d.healey]

@pcs800 Being filters I suspect the range is 20Hz - 20kHz

[pcs800]

@d-healey Thanks