[sdiy] CV and current Boss guitar multifx boxes?

[CCartCat at aol.com]

Lurker offers some inexact info (standard disclaimer applies):

Any Roland/Boss expression pedal input I've messed with is TRS.  Since I 
(ignorantly) used the Control Voltage feature on a DOD FX-17 Wah-Vol as an 
exp. pedal with some continued success, I must have grounded out the 
Roland/Boss own voltage source.  So I guess that the Tip is the return 
voltage, the Ring the outgoing source voltage and the Sleeve is ground.  

Since then, I've used a passive volume pedal with the mono ends of an insert 
cable connected to the pedal and the stereo TRS end connected to the 
Roland/Boss whatzit's exp. pedal input.  Pot value, dunno, off hand.  And 
whether this set up is optimal is another thing.

But unless totally & continuously grounding out the Roland/Boss voltage 
source is a bad thing (which wouldn't make sense, but as I am a mere 
wayfaring lurker . . .), this means you can feed your own CV into the exp. 
pedal if you wanted.  FWIW, the DOD Wah/Vol pedal's CV range is 0 to +5 volts.

Submerging now,
Kevin

<<Does anyone know exactly what a Boss multifx box expects to see on its 
control input? I think it is a variable resistance, but can anyone 
confirm this, and if so, what resistance range does it expect?
I have been asked to control one via CV, so I'm thinking of a current 
convertor
and a led/ldr setup. I can't get inside the fx box (and, don't wnat to!)

paul perry Melbourne Australia
>>