Rex Probe is an engineer associated with Serge Modular Synthesizer development and manufacturing during the system's early commercial period.

Probe contributed to the engineering and production of Serge modules, helping translate Serge Tcherepnin's CalArts prototypes into instruments that could be built, sold, and maintained for composers and studios. The Serge system's reputation for reliability and sonic versatility depended on careful circuit implementation by engineers like Probe.

While less publicly documented than Tcherepnin himself, Probe's work supported the small but dedicated Serge community that preserved the format through the decades when large manufacturers ignored modular synthesis.

Notable products: Serge Modular Synthesizer.