I make an electronic gadget for musicians. The project was inside my domains -- plural. There aren't a lot of people out there who are both working musicians, a

I make an electronic gadget for musicians. The project was inside my domains -- plural. There aren't a lot of people out there who are both working musicians, and also familiar with electronics including small scale manufacturing. The latter, I picked up from internships and early-career jobs. What it meant was that I could make the jump from problem space to solution space quickly and cheaply. I still haven't quit my day job, but my business produces a reasonable side income.