mod for morley emerald echo analog delay box...

[hackertronix]

you know when you twist the DELAY pot on most any analog delay box, you get this wild pitch bend sound? when if i got an expression/volume pedal, and hooked it up to the delay control of the emerald echo?!

the real question is, what is the plausible solution? add a 1/4" phone jack out from the delay pot to the pedal? also, i assume i should use the matched value of the delay pot, and replace the pot in the expression pedal with that value, or add resistors to match it?

opinions?

[Taylor]

Yep, it'll do what you want.

The delay time in that circuit is controlled by a 1 meg pot wired as a rheostat (2 connections), which is lucky in that you'll only need a mono cable. You will need to change the pot in your expression pedal/volume, as none will be 1 meg as far as I know. This presents a mechanical issue: are any geared pots available in 1 meg? (I honestly don't know, but you can check smallbearelec.com.) If not, can you hack together a pinion that will fit over a standard pot? You are hackertronix, after all.

You can't add resistors to a smaller pot to equal a larger pot's functionality.

[hackertronix]

is that lee van cleef in your avitar?! 

yeah, i see what you mean. i might be able to make a pot reach 1m, but i would not have the variance needed.

it's been forever since i took a volume pedal apart. do they have a pot with a longer shaft? if so, i can see where that might be hard to find. there has to be one somewhere...

would i want to disconnect the one in the delay box if i can do this?

[Taylor]

They're all different. The EB ones have a little wooden wheel with a string. You can buy this wheel and it might fit on any regular pot. Others have a rack and pinion gear.

Http://www.smallbearelec.com/Categories.bok?category=Wah-Wah+and+Swell+Pedal+Parts%2C+Wah+Inductors

You could either add it in parallel with the one in the box, or use a switching jack to disconnect the one in the box when the expression pedal is plugged in.