this one would work for any machine that has a base-width filter but it would be great if when changing the HPF value of such base-width filter there would be the option of keeping the LPF fixed at its current value, without having the LPF shifting in relation to the HPF (and vice versa).
for example, in the AR Reverb FX page, you could hold down the F encoder whilst turning the E encoder so that the LFP is not affected, if that makes sense