There's a huge number of boutique products in music technology, particularly synth modules and guitar effects pedals. They're relatively simple analog products,

There's a huge number of boutique products in music technology, particularly synth modules and guitar effects pedals. They're relatively simple analog products, so it's entirely feasible for one person to design and manufacture a small batch in their bedroom without a big investment. https://www.modulargrid.net/e/modules/browser https://www.modulargrid.net/e/modules/browser