A01, B01 - Microphone Amplifier
A02, B02, C02 - Signal Conditioner
A03, B03 - Analog to Digital Conditioner
A03, B03 - Interface with & Protective Circuit for ADC
A03 - Read from Left OR Right
A09/A10, B08/B10 - Opto-Isolators, Drives, & Switches
C07, C09 - Actuator Drive, Switches