I just wired a 100k linear pot to 2 jack inputs and thought I would have an attenuator (just like the one in CP-251), but even when the pot is turned all the way anti-clockwise some CV is there. The CP-251 attenuators cut CV to zero. What am I missing?
A ground?
Facing the front of the pot, you should have the left terminal to ground.
The middle (wiper) terminal to your output.
The right terminal to the signal you’re attenuating (your input.)
If your pot value is too low, you’ll load down your input.
If it’s too high, you’ll get noise or poor response when turning.
10K to 250K is common. 100K almost standard with synths.
Taper is up to you, but linear is recommended for most CV applications.
Hope this helps.
K
Thx, I’ll give it a try tomorrow
Btw, when facing the pot, the description above assumes the terminals are facing down, not up.
Good luck.
do they make pots with 1/4" connectors?
do they make pots with 1/4" connectors?
I’ve seen plugs with built in attenuators (headphones often do this with an inline volume control.)
But I’ve not seen anything commonly available, so even if “they” make them, the minimum number one might need to order could eliminate this as a viable option.
There’s always expression pedals, but you’d have to wire them a bit differently.
The Moog ones expect +5 V on the ring, so to attenuate a CV it needs to be “input” into the the ring and “output” through the tip, with the sleeve as common ground to get full attenuation.
Edit: or is that the other way around (in: tip; out: ring) to keep the expression pedal functioning as you expect?? I always get that mixed up.
Please correct me if I’m wrong Kevin 
You’d need a “stereo plug to two mono sockets” connector, that’s if you’re using a patchbay, or sockets on both ends otherwise. Or a stereo-Y cable etc.
These “Port-a-Pots” and “Move-a-Mults” were from the Moog Archives site. Im sure something like this wouldn’t be too hard to wire up.
The first photo are Y adapters I’d recommend avoiding.
I have some and they’re not too reliable.
I also have a small collection of custom goodies much like the ones Eric showed above.
Switchcraft jacks like those are a lot more reliable.
As for which is correct for ins and outs on the pedal, I don’t know.
I’d have to look it up too.