Relay switch installation in a Small Clone

[jdiogon]

Hi everyone !

I'm trying to put a relay-based switch into my EHX Small Clone chorus pedal, but I have a few questions I don't manage to answer.
The relay board I would like to install is this one : https://support.banzaimusic.com/api/v1/articles/75/attachments/85476/download
I will install it with a new momentary switch.

I'm having troubles identifying everything I must connect to the relay.

The things that I think I know how to connect are :

- Input jack
- Output jack
- FS1 Either terminal of momentary SPST switch : this is new since I'll change the switch
- FS2 Other terminal of momentary SPST switch : this is new since I'll change the switch

Those were easy 

I don't know how to connect :

- Effect circuit's input
- Effect circuit's ground
- Positive voltage supply
- Effect circuit's output
- LED Anode

Currently, it seems that the power input is going first through a 47 ohms resistor, then the LED, then to the switch.
That's also why I don't know how to wire the new switching system.

Also, will changing this in some way affect the behaviour of the pedal ? The tone ?

I'm lost, please someone help me 

Below, a picture of the current board.
Tthe 2 blue cables come from the input and output jacks.
The LED is out of the picture bottom-side.
Also we can see the 47 ohms resistor.