This guide explains how to use a 10k potentiometer connected to the GPIO Voltage Input Card to control audio gain in your system.

Wire the 10k potentiometer to the GPIO Voltage Input Card
(Follow the wiring reference for the correct pin connections.)

This allows the potentiometer’s voltage sweep to be read as a control signal.

Add these blocks to your project:

• GPIO Voltage Input Card

• Control Range Scaler

• Control Linear to Log Converter

• Voltage Controlled Amp

• Analog Audio Output Card

• Route your audio source into the Voltage Controlled Amp.

• Route the scaled control signal (from the Control Range Scaler → Linear to Log Converter) into the control input of the Voltage Controlled Amp.

• Potentiometer at full rotation → Unity gain

• The meter shows the corrected control value using the Control Range Scaler, compensating for voltage variation.

• Rotate the potentiometer → audio volume changes accordingly

• Verify that the meter reflects the accurate, scaled control value.