wah as Expression pedal?

[sulkbooth]

I've tried my old Ernie Ball volume pedal as an external expression pedal, and it works perfectly (don't know the model number, its about 15 years and only says Volume Pedal on it)

 

I also have a Dunlop Jimi Hendrix wah, but this did not work. (does it need a battery maybe? 😩)

Anyone have success using a way?

[PeterHamm]

I don't think you'll have success with this without heavily modifying the pedal.

[sulkbooth]

Ok, thanks for the response. Do you know why? They both have potentiometers, but I suppose there are different resistance?

[Ka5par]

Maybe this will help?
http://www.strymon.net/strymon-tech-corner-2-build-your-own-expression-pedal/

[jaminjimlp]

From:

http://missionengineering.com/

 Wiring.
Most potentiometers have three connectors; Clockwise, Counter-clockwise, and Wiper. Amazingly, there are multiple different ways these can be wired, all achieving largely the same result, which means yet more variations for expression pedals. The most common expression pedal wiring is to connect the pot to a 1/4″ stereo (TRS) instrument jack as follows:

CW —— Sleeve
Wiper — Tip
CCW —– Ring

An alternative is with the tip and the ring reversed as follows:

CW —— Sleeve
Wiper — Ring
CCW —– Tip

Yet a third way is as follows:

CW —— Sleeve
Wiper — Tip
CCW —– Tip

 

In this last one, the wiper and CCW are bonded together and connected to the tip and the ring is unused. This requires the use of a mono (TS) cable such as a regular guitar cable, in place of the stereo (TRS) cable used in the other two. These three are the most common that we see in expression pedals, but we keep finding more. Sometimes a dual gang potentiometer is wired in parallel to create a single pot with half the resistance. For example you may see a dual 20K Ohm potentiometer bridged into a single 10K. In this case the pedal will function the same as if it were a native 10K Ohm single pot.

.....................................

 

OK so now we know we can do this:

 

This also alleviated the backwards operation problem and the 0 - 100 - 0 problem...

 

The third way is the Line 6 way. (after some google searches I found this out)

 

which means after the conversion you don't need to use TRS cables anymore you can use TS cables. Also now with either the 12k ohm pot in the one and the 10k ohm pot in the other I get full 0% to 100% on the Helix control.

here is what I did to make mine compatible so there would be no need for re configuring. the Potenteiometer on this 1 is 10k

Here is before

here is after... so just moving 1 wire (the green/ring) and put it together with the (red/Tip) and the (black/sleeve) stays the same.

also I jumped out the black on the side pot that is for changing the "throw" of it to disable it and not doing it made it have issues when you adjusted it it would not go back to full throw. (If that makes any scents to you)

My other one

here is after... so just moving 1 wire (the green/ring) and put it together with the (red/Tip) and the (black/sleeve) stays the same.

 

this model had a duel 24k pot and I soldered each connection 1,2 and 3 to 1,2 and 3 (you see it better in the picture above) making it a single 12k pot

 

This can be done with a soldering iron with no extra solder. just heat up the green wire pull it off and put it on with the red and heat it up to connect it. 

 

 

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I am re-posting this from another thread on the same thing

 

 

 

 

 

ALSO:

 

from yet another post....

 

Really you could take an old crybaby or Vox waH and just rewire it and it would work the same.

Here is one new:
http://www.guitarcen...ffects-Pedal.gc

Most wah wahs have a 100k or a 250K potentiometer, most expression pedal seem to have something around 10k to 25K, after doing a little research there is some folks that said they have used 250 K pot and rewired a Wawa pedal to work as an expression pedal and it worked fine or you can just buy a new potentiometer (thank sure it is linear and not audio taper or logarithmic) for an expression pedal and put it in if you have to but I would try to go ahead and wire it up first according to the way that I have explained above. 

Remember you don't have to worry about getting tip ring sleeve input jacks just tip sleeve is all you need and is what is already on a Wawa pedal