> Thanks. Crazy Kong (bootleg on Galaxian hardware) is close - but lacks the punchy > base of the correct version. Perhaps the sound emulation isn't quite correct.
Assuming you aren't playing on typical plastic computer speakers and wondering where the bass went, the answer is probably "the cabinet". Wooden arcade cabinets are a pretty decent approximation of an echo chamber for bass, so they tend to sound bassier than the crappy car-door speakers installed in them would normally merit.