NOOB Audio question about sharp clicking with a switch/button

What i would like to do is, interupt the audio signal going into the delay unit, unforutately its producing a sharp click at the point of contact. Im wondering what i need to do/add in order to kill this click.

Video Demo of me using the button

Try putting a moderate value resistor (10k?) directly across the input connections on the board.
It may also help to have one across the jack socket.

That will give a DC path to ground so any coupling caps have a stable bias and are not adding a voltage across your switch.

If the above doesnt work try a 10k in the jack plug itself.
Sounds like there is a dc potential on the jack, and plugging it in charges up the input cap causing the click.