I would guess no. A quick search
http://www.musiciansfriend.com/navigation?q=volume+pedal lists a bunch of "volume pedals" (I use quotations because certain pedals like the yamaha FC7 is an expression pedal and gets plugged into a pedal port) but other pedals such as
http://guitars.musiciansfriend.com/product/Boss-FV500L-Stereo-Volume-Pedal?sku=151041 are true analog volume pedals.
That would be for stereo,
http://guitars.musiciansfriend.com/product/Boss-FV500H-Mono-Volume-Pedal?sku=151042 would be for mono. Stereo may or may not be important to you. Do some research before buying though, the mono pedals are usually designed for guitar so I'm not sure what it does if you use keyboards through it, specifically the difference between active and passive volume pedals.
Oh also, you'll notice there's five inputs in the stereo volume pedals, what for you might ask? 2 in, 2 out, and 1 "CV" (control voltage) in essence, acting as an expression pedal that you can plug into your expression pedal slot in your keyboard, if it accepts it, using the right patch cord (a TRS patch cord instead of a TS patch cord).
What are these you might ask? Well
http://accessories.musiciansfriend.com/product/Live-Wire-TRSTRS-Balanced-Patch-Cable?sku=330494 is a TRS (tip-ring sleeve, don't ask me what it means, has to do with grounding, I dunno) patch cord (balanced), used for the likes of pedals and things like that, whereas something like
http://accessories.musiciansfriend....-14-Patch-Cable-with-Neutrik-Plugs?sku=339036 would be a TS (tip sleeve) patch cord (unbalanced) used for guitars, keybaords, basses, etc. When you hear hum in an amp, it is because patch cords are unbalanced and are picking up "noise" (frequencies) in the room, and you are hearing it. If that's confusing don't worry too much about it. Just know that to use the volume pedal as an expression pedal you would need a TRS patch cord.
How do you tell the difference you might ask? Well besides the fact that they are labelled balanced and unbalanced, you can tell because the balanced cables (
http://accessories.musiciansfriend.com/product/Live-Wire-TRSTRS-Balanced-Patch-Cable?sku=330494) have two black rings whereas the unbalanced cables (
http://accessories.musiciansfriend....-14-Patch-Cable-with-Neutrik-Plugs?sku=339036) only have one (the fact that they are different medals is unimportant with regard to balanced vs. unbalanced).
