The Pioneer CT-339 is a dual-cassette deck that incorporates various features tailored for playback and recording. It is designed to support both standard cassettes and offers capabilities for high-speed dubbing, allowing users to create copies of tapes quickly. The device is equipped with an auto-reverse function, enabling uninterrupted playback on both sides of a cassette. The CT-339 also supports various recording modes, including normal, high-speed, and the option for Dolby noise reduction which improves audio quality by reducing hiss. Additionally, the deck features LED meters for monitoring levels, and is compatible with a range of cassette types, including chrome and metal tapes. The design includes a straightforward user interface with controls for play, stop, rewind, and fast-forward, making it accessible for users of all experience levels.