Ay 3-81912 fpga replacement.... with few extra fetaures :-)
AMSTRAD MODE :
- Orginal audio output /3 channels/
- Keyboard works
- joystick works
- additional crystal clear sound output STEREO ABC /amstrad standart
- installation - just replace chip...
- in order to get best sound quality (OPTIONAL) :
- desolder / cut out 4 resistors next to jack stereo ( CPC6128 - R117,R118,R119,R120)
- connect 2 wires AL/AR from AY_FPGA to amstrad pcb according below diagram
- or... make a drill in the case and connect AL,AR,GND to extra audio output :-)

ZX SPECTRUM MODE:
- 2 x AY inside - Turbosund.
- plug and play / remove old AY, insert device back/
- Orginal audio output /3 channels/ - no change here are mixed to mono
- but... EXTRA STEREO SOUND output with ACB AY`s mixing
- additional pad to solder beeper from ULA to get ULA SOUND (JP1) mixed at additional stereo output
- ULA sound IS NOT mixed to orginal 3channel audio output, only to ACB STEREO OUT
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