Wiring up Battery for Guitar Pedals

How to wire up a battery so both battery and power supply could be used.
(I made this one a while ago, forgot to upload it)
Schematics, diagrams and more detail on:
barbarach.com/...
Other DIY Basics posts:
barbarach.com/...

[@mrki4937]

Thank you for sharing. I found it very helpful.

[@thomasulrich3107]

Very helpful that stuff about the stereo jack, thank you man!