Thanks. After several reboots (one intentional and a couple earlier when screen just rebooted itself) the reverse spaceship seems to have worked over a couple of drives. Previously, first drive after a reboot it would work, but then subsequently not. Iirc this was the behaviour when some people fitted their own speaker but didn’t get it properly enabled. So sounds like it either had not been coded when we collected or it needed a proper ‘steering’ reboot to stick. Car had firmware updated during SC visit.
Anyway, as long as it remains working then happy. No one, in particular school kids, could not claim that they didn’t hear us reversing off our drive and blame it on a silent EV.
As for forward, it’s quite different noise and very subtle - not that I have yet to confirm that ours was actually working, but I happened to be recently walking past a slow moving Model 3/Y and it was definitely making some noise (or they were driving on a flat tyre), but hard to identify what it was. My take was that the car was just louder than it would otherwise have been without being any specific noise. Unlike reversing, not sure though if it’s obvious enough for when you are stalking people around a car park! Is that when fart mode comes in handy?