AY music & sound effects on the ZX Spectrum

Compose, play and embed music and sound effects on the ZX Spectrum's AY-3-8912 sound chip (128K / +2 / +3 and Timex TS2068) and the 48K beeper. Use this WHENEVER the user wants AY/PSG music or sound FX on a Spectrum, to drive the AY's three tone channels + noise via its registers and OUT ports, hand-write register values for a note/effect, write or integrate a 50 Hz interrupt player routine, work with trackers (Vortex Tracker II / PT3, Arkos Tracker 2 / AKG/AKY/AKM) or formats (.ay, .pt3, .psg register dumps), squeeze multi-channel music out of the 48K beeper (Tritone-style 1-bit engines), or audition a tune in an emulator. Reach for this for anything beyond a one-off BEE…