# Reverb & General FX Modules **URL:** \ **Category:** KOSMO MODULES\ **Created:** [May 2, 2022, 6:59pm UTC](https://lookmumnocomputer.discourse.group/t/reverb-general-fx-modules/4963 "2022-05-02T18:59:59Z")\ **Posts on this page:** 1\ **Showing post:** 13
**Author:** ![Dud](https://yyz2.discourse-cdn.com/free1/user_avatar/lookmumnocomputer.discourse.group/dud/32/610_2.png) [@Dud](https://lookmumnocomputer.discourse.group/u/Dud)\ **Post date:** [May 4, 2022, 11:41am UTC](https://lookmumnocomputer.discourse.group/t/reverb-general-fx-modules/4963/13 "2022-05-04T11:41:20Z")
You can use a Vactrol (or a diy one : LDR + a led), or another solution for better control and result is adding a little circuit some info here > [@Adding CV to existing circuits](https://lookmumnocomputer.discourse.group/t/adding-cv-to-existing-circuits/1305): > > hey friends, I am working on a project (BD++) and am wanting to add CV to a parameter usually controlled by a potentiometer. here is the existing circuit: [vactolQ1] I understand since this pot is acting as a variable resistor it can be replaced with a cv source via vactrol. Is it possible to just sum them together, pot and CV? something like: [vactrolQ] is there an easier way to do this without using vactrol? opamps? and here > [@How to add CV control to a knob on existing module](https://lookmumnocomputer.discourse.group/t/how-to-add-cv-control-to-a-knob-on-existing-module/3634): > > Hi, Recently exploring the amazing world of clocks/dividers and everything in between. I found something perfect for my needs and budget to generate polyrythms. the CLK from REBEL tech. which has three knobs that control 1.Master tempo 2. /8\* out 3. /24\* out. As this is on github : [GitHub - pingdynasty/CLK: CLK is a triple clock generator Eurorack module from Rebel Technology](https://github.com/pingdynasty/CLK) I was wondering if anyone would know how to add CV control either simply to the master tempo and for more complexity CV … --- _[View the full topic](https://lookmumnocomputer.discourse.group/t/reverb-general-fx-modules/4963)._