mute

Hi all, this is my first post here: Mute button: My BMW head unit has a mute/volume button. The encoder, when pushed-in mutes the head unit. Today, I accessed the encoder and soldered 2 wires on the 2 pins which join when the encoder is pushed-in. See photos/video. Triggering: I have a...

What is the simplest way to reverse the logic of a switch? What I have are audio levels running to a jack or speakers. I figured out how to simply add a Sanwa arcade button to interrupt the flow when it is not pressed and simply complete the circuit when it is pressed. The question: is there a...