Guitar signal to logic level?

[vashuba]

Hey so I’ve been doing some research and the signal must be logic level for the Arduino to register.
Do we have a way to convert it?
then run the signal back out into the amp
I’m confused
Cheers

 

[Robert]

Here's the schematic for the ElectroSmash PedalSHIELD for Arduino, should give you some ideas.

https://www.electrosmash.com/images/tech/pedalshield/pedalshield-schematic.png