I bought the EBS Multicomp.
I looked this up, it appears to be a nice compressor but you are aware that's not the same thing as a high/low pass filter, correct?
If I am repeating information you already know, I apologize in advance, but just in case...
A compressor smooths out the peaks and valleys of your signal. So the very loud stuff gets a little quieter, the very quiet stuff gets a little louder. There's a bit more to it than that, but that's the basic function of a compressor.
A high pass filter diminishes frequencies below a certain point. Some HPFs have that point as a variable, like the Broughton pedal. Basically it helps cut out muddy/rumbly subsonic frequencies that you can't hear well anyway so your speakers aren't working too hard, which cleans up your sound and makes your rig more efficient.
A low pass filter is the opposite, it filters out high end frequencies. It's useful for taking care of things like string noise, hiss, or stray noise from your pedals.
There are some pedals out there that do both, but from what I can see the EBS multicomp does not have a built in HPF/LPF, at least not one that's controllable from the knobs and buttons on the pedal. Maybe there's some always on filtering built into it, but I can't find anything about that with my 5 minutes of googling.