A HPF/LPF is a fairly generic device. The two criteria you want to pay attention to are the signal quality and the available frequency range affected by the cutoff.
For bass you’ll want a HPF cut that goes down as low as possible. So 25Hz on the low end up to around 100Hz or thereabouts is a good range for a bass HPF.
For a LPF you’ll want something that covers the rest of the frequency range above your HPF’s highest setting. In a combo box the ranges will seldom overlap. But starting around 300Hz or so up to 5KHz is a good range for a LPF you’re going to use with a bass.
Signal quality is a subjective thing. But most times you’ll want this sort of box to be as transparent as possible. Since you’re sculpting your sound with the filters you don’t want the box adding any coloration of its own most times. You just want it to do its thing as cleanly and quietly as possible. A lot depends on the design and build quality to accomplish that. And achieving a transparent signal isn’t easy to do. So be aware that even with something as generic as a filter, the quality may vary from brand to brand even if the other specs are the same. Cleaner and quieter usually costs more money. (For the record, VFE makes a good product. I bought a few of their pedals. And I’m a happy customer.)
IIRC the Focus pedal has since been discontinued. The Pinball is an interesting device I’ve had on my radar for awhile. The only thing that’s kept me from getting it is the HPF only goes down to 100Hz so it doesn’t hit the 25-60Hz range I’ve found most useful to have for a HPF. And the LPF goes up to 7KHz. A bass’s highest overtones only go up to around 5KHz. And most of what’s interesting on a bass as far as fundamentals and overtones is concerned is found between 60Hz and somewhere around 1KHz and change.
So the Pinball has excess range on the high end and insufficient range on the liw to give me what I’m looking for in a hi/lo or bandpass filter. But it does have some interesting uses beyond just that. I see it more as a super “voicing” device rather than straight ahead filter. But for cleaning up all that junk you get between 25-60Hz with electric bass, it’s not gonna get you there.
As an effect I think the Pinball is way cool. As a replacement for a HPF/LPF filter I don’t think it’s bass specific enough if you mainly want just that.
