ProppFrexx ONAIR is an all-in-one playout and radio broadcast automation system designed for live-assist and fully automated operations, from web radio stations to large terrestrial broadcasters. Built for reliable 24/7/365 use, it combines high-grade audio, broad playlist management, scheduling, scripting, streaming, voice tracking, advertising, news, logging, and remote control in one Windows environment. Any number of playlists can run in parallel, each with up to four DJ players, while two Outlook-style schedulers handle regular programs and overlays such as adverts, news, jingles, and top-of-hour elements. The UI-driven scripting engine supports fixed-time events, conditional rules, timing updates, segue types, rotation histories, and remaining-time scheduling without requiring programming. Its unlimited mixer supports custom inputs, outputs, subgroups, routing layouts, DSP and VST processing, and ASIO, WASAPI, or WDM sound cards.