AY is the nickname of the AY-3-8910 programmable sound generator family. The Amstrad CPC sound processor is more exactly the AY-3-8912.
This chip was very popular and was used in a lot of machines.
[[MSX]], [[ZX Spectrum]], [[Atari]]... all used chips from this family (sometimes it was the YM variant instead of AY...). The YM variant differed only in the hardware envelopes where it used 32 steps compared to 16 steps for the AY.
[[MSX]], [[ZX Spectrum]], [[Atari]]... all used Chips from this family (sometimes the YM variant instead of AY...) As a result it is still quite popular in the actual Chip Tuning Tune movement as a vintage sound processor.
Many Chip Tuning Tune sites include AY files and scene.
HalasAlas, the [[ZX Spectrum]] is more often used as reference. But a huge library is available.
==Amstrad Plus specificity==