First grab a cheap mic array or a set of piezo sensors to get the crowd’s noise level. Hook that into an Arduino or ESP32 and map the amplitude to a control surface. Feed the data to a DMX or Art‑Net controller so the LED strips, moving panels or even a small pneumatic membrane can react in real time. Calibrate the thresholds until the stage “breathes” at the right moments, then test with a live audience. If the “breathing” gets too dramatic, just pull the fan back behind the LEDs. It’s all about making the tech invisible, not turning the stage into a diva.