ZEsarUX still has one of the worst AY emulation engines among other emulators (along with ZX-Poly). Doesn't have any frequency selection (22k/44.1k/48k), and doesn't have YM2149 emulation at all.
https://docs.google.com/spreadsheets...tMQ/edit#gid=0
v10 has [almost] the same as v9 (maybe even worse).
https://volutar.myds.me/zx/ayymtest recorded samples (FLAC) from real and different emulators (to compare by ear or with any audio software).
Such awful sound quality is real pity.