Audio input/output switch

I have the following audio input devices in my room:

• Computer (eg. youtube or winamp)
• Guitar
• Vinly Disc

And the following output devices:

• Amplifier
• Speakers
• Headphones

So I had so many jack cables that I could connect to each other in many ways, depending on the use-cases:

• Computer to Speakers (by default, when listening to NIN)
• Guitar to Amplifier when my wife is not working from home
• Guitar to Headphones when my son is sleeping
• Computer to Headphones when I am programming at night and do not want to disturb my family
• Vinyl to Speakers for background music when a friend visits us
• Vinyl to Headphones when I am drinking whiskey and everyone is sleeping
• ... etc

So I created a small device that does the audio switch for me (I can select what I want to use as input device and where I want to have the output), it looks like this:

Note: my child is a toddler (2.5 yrs old), so he loves playing with stuff with buttons, so I added a child lock (key) as well.

This is how it looks like under the hood: