The GPIO connections enable remote control of key parameters of SmartAmp:
| Function | Notes | |
| GPIO GND (1) | Ground reference for all GPIO pins | |
| GPIO v12 (2)* | Channel 1 & 2 auxiliary gain control | Connect to a potentiometer (>10kΩ) wiper between the VCC and GND pins. The maximum level available when using GPIO control is defined by the front panel gain control setting. |
| GPIO V34 (3)* | Channel 3 & 4 auxiliary gain control (four channel amplifiers only) |
Connect to a potentiometer (>10kΩ) wiper between the VCC and GND pins. The maximum level available when using GPIO control is defined by the front panel gain control setting. |
| GPIO VCC (4) | Control voltage output | Provides a 3.3V DC control output (100Ω output impedance) for up to two volume control potentiometers (>10kΩ) |
| GPIO STB (5) | Alarm Mute | Connect to GND pin to mute the unit and place it in standby mode |
| GPIO GPO (6) | Mute Out | OV DC indicates normal status, +3.3V DC indicates one or more channels in protection mode |
*In order to conform to EMC specifications, shielded cable must be employed when connecting external volume control potentiometers to the GPIO connectors. This is to prevent the cable acting as an antenna for any radiated emissions from withing the amplifier.
Be sure to use the appropriate Euro Block connector for the GPIO inputs.