The “AY 38912 Sound Tool” allows you to manipulate the AY sound chip registers.
Left/Right on joystick to select sound register.
Button 1 retriggers the hardware envelope.
Button 4 and joystick L/R to change values.
Button 3 changes values in steps of 10, Button 2 steps of 100.
You can save into 4 slots by holding down on the joystick and pressing button 1-4. You can load these slots by holding up on the joystick and pressing buttons 1-4 to recall.