This is just a short update. Remember my last post where I presented the final design? Well, I should not have called it final before testing it in the car itself 😉. While doing so I discovered a whine played over the speakers that rose and fell with the RPM of the car. With more and more cars faking engine sounds over the speakers, you could call this a feature instead of a bug. In any case, it's not what I wanted, so back to the drawing board.