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Anyone ever use pedals with Eurorack modular synths?

p_wats

Active member
I've been toying with starting a DIY modular synth setup, but am still on the fence, as that journey sounds addictive, expensive and never-ending (and I already have pedals on the go).

I'm curious if anyone has any experience adopting pedals for Eurorack. I understand there are circuits/modules available to deal with the signal difference (drop gain on the way in, boost it on the way out, etc.), but I'm also interested in adding some CV control.

I've read about people having some success with a simple vactrol-based circuit to take incoming CV and output resistance that could be used depending on the original pot configuration.

Anyone have any thoughts/experience here?
 

K Pedals

Well-known member
I've been toying with starting a DIY modular synth setup, but am still on the fence, as that journey sounds addictive, expensive and never-ending (and I already have pedals on the go).

I'm curious if anyone has any experience adopting pedals for Eurorack. I understand there are circuits/modules available to deal with the signal difference (drop gain on the way in, boost it on the way out, etc.), but I'm also interested in adding some CV control.

I've read about people having some success with a simple vactrol-based circuit to take incoming CV and output resistance that could be used depending on the original pot configuration.

Anyone have any thoughts/experience here?
I use this to interface
Modular is extremely addictive 😂😂
I’m on my 4th case
And I built my first module the other day ...
 

bifurcation

Active member
Oh hell yeah, ditto on the addictive. I forget which module I use as a guitar input, but it has a built-in envelope follower, which can be useful. I've done some pretty wild shows with a guitar or bass (and once a homemade instrument) going into modular.

Befaco has a bunch of cool kits that are pretty easy to build.
 

K Pedals

Well-known member
Oh hell yeah, ditto on the addictive. I forget which module I use as a guitar input, but it has a built-in envelope follower, which can be useful. I've done some pretty wild shows with a guitar or bass (and once a homemade instrument) going into modular.

Befaco has a bunch of cool kits that are pretty easy to build.
You talking about the doepfer???
 

p_wats

Active member
Thanks! Has anyone tried to modify pedal designs to accept CV input for extra fun with the rest of the system?
 

bifurcation

Active member
Thanks! Has anyone tried to modify pedal designs to accept CV input for extra fun with the rest of the system?
The simplest way is to build some DIY vactrols (see below.) You'd have to add an attenuator and/or tweak them to fit the range of whatever potentiometer you replace/enhance, but you could replace/enhance pretty much any control on any pedal.

 

p_wats

Active member
The simplest way is to build some DIY vactrols (see below.) You'd have to add an attenuator and/or tweak them to fit the range of whatever potentiometer you replace/enhance, but you could replace/enhance pretty much any control on any pedal.

Thanks. Yeah, that's what I had seen done before--there are layouts/schematics floating around for this purpose.

It would be cool to take something like one of the extra Arachnids I have laying around and convert it for modular use---specifically the older version with the regular pot to change between patches, as that strikes me as a cool possibility to change patches via CV for maximum nonsense.

We'll see if I go down this road at all (trying to resist diving in to modular).
 
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