A real-sounding procedural car engine: exhaust pulses per cylinder through headers, muffler and tailpipe, with induction roar, gear whine, turbo spool/blow-off and overrun crackle. Five characters (crossplane V8, flat-6, V12, I4 turbo, I6 twin-turbo). Drop the driver behavior on any vehicle and it revs from its speed, or feed it your own rpm/throttle.
