does "exp in" jack also mean "CV in" jack?

[Alien8]

I have a number of pedals that I wish to control parameters using Control Voltages a la MOOG CP-251.  My question is rather broad with regards to products on the market, but here goes:

If a pedal has an EXP IN jack on it somewhere to control some parameter, does that mean that you could also input a control voltage into this jack? 

Any help would be great...

[Mark Hammer]

Yes.  On the other hand, there is no real standardization across manufacturers with respect to what range of control voltages that pedal is designed around.  It could be 0-5v, or 0-10, or 0 to -5v, or something entirely different than any of those, depending on manufacturer and what their "expression pedal" is designed to produce.  So, while you can certainly begin planning around use of the EXP in with control voltages, don't plug anything in until you know what the anticipated range of voltages ought to be.

Having said that, there are not a whole lot of manufacturers  producing their own proprietary expression pedal, so it may well end up that Roland/Boss' pedal is a lot more standard and compatible than you or think.

[Alien8]

Excellent!  Thanks Mark!!

Subsequent to your answer, is there a simple way using a multi-meter to find the limits of the expected voltages , or do I need to find spec's on the net?

(the pedal I am specifically questioning is the EH HOG)

[Mark Hammer]

Oh heck.  If it's the HOG, then its new enough that you should be able to find the specs in the manual (available online) or at the very least from a polite note dropped off to the tech support people.   Several folks here have been fortunate enough to have bought one for themselves so they might have the info you need already.

[Rmanen]

Would I be able to use the exp pedal inputs of the lovetone meatball as a CV in? I am currently building one, and the way they are created in the schematic is different for both.

Peace

[Paul Perry (Frostwave)]

If a pedal has an EXP IN jack on it somewhere to control some parameter, does that mean that you could also input a control voltage into this jack?

Maybe, and maybe not.
In the case of my commercial Frostwave pedals, the CV inputs expect an actual control voltage.

But in the case of nearly all effects with an "expression" input, they expect to see an "expression" rocker pedal plugged in.
And different manufacturers want different pedals - maybe a different value pot, maybe differently wired to the plug.
Normally, these expression pedals work either by having a tip/ring/sleeve (stereo type) plug, so the effect sends a voltage to the rocker pot & the wiper sends back a variable voltage.
But some - such as the Behringer - is simply a variable resiatance, that (presumably) controls a current generator back in the FX box.

What can go wrong if you just ram a mono plug with a CV source into a random "effect" socket?
Well, you can short out the voltage that is supposed to be sent to the pot.
More seriously, you could exceed the voltage the FX unit expects to receive back from the pot, and damage the microprocessor or whatever.