Multi-PC USB Audio Mixer With XMOS XU316

In this project, I have designed and built a custom USB audio mixer system using XMOS XU316 microcontrollers. The goal is to allow one person to connect to four separate computers simultaneously, mix their audio outputs into a single headphone feed, and send a microphone signal back to each PC selectively using push-to-talk buttons. I'm handling both hardware and firmware architecture, creating schematics, managing power, USB, and audio routing, and setting up inter-chip communication using XMOS’s xCONNECT (xlink) links. One main XU316 serves as the central mixer, receiving audio data from the three other chips over xlink and outputting the final mix to a DAC for headphone use. A single ADC digitizes the microphone signal and distributes it back to each XU316, which forwards it via USB to its connected PC when the corresponding button is pressed. This project combines audio engineering, USB communication, and high-speed digital interfacing in a tightly integrated embedded system.