Yes, emulation is like that. Emulated N64 graphics are often better than the real thing now (Super Mario 64 and GoldenEye stick out to me, on my GeForce FX5200 which is already a "bad" graphics card).
SNESamp 3.2's "High quality emulation" is supposed to make it sound better, and sometimes it does, but it also makes cymbols and other instruments sound grating and too loud, like in FF6 Celes, MMX3 Crush Crawfish, and other songs...