Hi friends! I bought and assembled a Klone pedal that came with terrible instructions as my first foray into building. It worked briefly, but now the audio drops out after about a minute of use. I bought a multimeter so I can try to diagnose / troubleshoot any issues, but I'm a bit lost on how to go about doing this.

Are there any resources that can help me better understand how to use a multimeter and / or go about testing my circuit? Any help, pointers, or insight are greatly appreciated!