Good morning/afternoon/evening to all … So, made my first foray into a pedalboard after using just a Zoom G3X for a few years, obligatory picture below from band practice last Tuesday: But, this post is to try and get a correct (and simple) understanding of the what the CFR control on the Caline (CP-26) Snakebite reverb pedal does; just to check on that … the LPF (low pass filter) works the same as a tone control on a guitar - right? I'm fine with all the other controls on this item but what exactly does the CFR (Centre Frequency control) do? From reading stuff on the internet (always potentially problematic I know) I believe the CFR will alter the frequency range that the LPF responds to; ie with CFR at 0 the LPF responds more to bass frequencies … with the CFR at 10 the LPF responds more to treble frequencies? Or, does the CFR interact more with the Res (Resonance) control to affect the tone of the resonance in some different way? Or, if neither of those two … please supply the answer …. Thanks. Meanwhile here's the pic. I can still attach the Zoom for wah/other effects - yes, I know the chain would be all wrong but if I were to use, say, wah wah, I wouldn't have other fx on. Also, I know the Snakebite should come after the Golden Tremolo … but if I need tremolo and reverb I can use the reverb on the amp. For those interested in this stuff …. Vitoos ISO4Plus power, Donner Golden Tremolo, Caline Snakebite, Joyo (JF-01) Vintage OD - for slight distortion, Akai (now Biyang) Blues overdrive - for simple boost/drive, Toms'line Tuner; Board is a Donner DB-2. Total cost c. £200/$280. Pleased with everything so far for the money … Best value for money, probably the Donner Golden Tremolo.