NESticle also hasn't been updated in over a decade, though to its credit, it was light years beyond the other available stuff at the time (iNES, Pasofami, etc). Still, in the last 10 years there's been so much major development in the field of NES emulation that I have to wonder why you're even bothering with NESticle anymore?
As far as emulators showing emphasis on improving sound quality, check out the changelogs to Ootake sometime. It'll put a warm smile on your face as you see his history of obsessively trying to perfect all aspects of PCE / PCE CD emulation.![]()