https://z80kits.com/shop/zxtt-module-by-quazar/
ZXTT Module - 1.7734MHz Clock for YM/AY chips - Z80 Kits
Jun 28, 2024 - Use the ZXTT Module to tune your AY-3-8910 Sound Card to the frequency used in the ZX Spectrum for your chip tunes to sound just as they did on the Speccy!
moduleclock