I really enjoyed the day and my cousin got inspired by the 'wall of sound' workshop by the Belgian band The sore losers. They had some really good tips on how to create your guitar sound, and one of the key elements in their setup was a simple A/B switch. They use the A/B switch to switch between 2 amps. This is a very simple -but clever- way to get a punchy solo sound : hit a button, second amp switches on > instant boost.
The trick is to set the second amp relatively 'clean' so you don't loose the 'punch' of your sound.
A couple of days later my cousin asked me if i could build such a switch, and this is the result :
