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Sonos 4 is a complete audio processing and linking (STL) system for radio broadcasters that runs on a Windows PC.Think of it as turning a PC into an Orban Optimod with many extra features. 

The software has the following major features
- Low latency (delay) mode with ASIO sound cards. Off air monitoring while speaking is possible.

- Supports multiple instances allowing one computer to run up to 8 processors simultaneously.

- Supports both Windows native sound interface (Wave) and ASIO interface (when provided by the sound card manufacturer). Sample rates up to 192kHz and sample size up to 32 bits supported.

- Four , five , six and nine band processors. The processor settings are fully adjustable with easy to use saving and loading of format files. Daypart scheduling is included. All four processors share common parts such as three stages of parametric equalization, stereo widener, phase rotator, filtering for FM and AM, switchable pre-emphasis for FM.
The processor architecture is similar in each processor. Single or three band gated AGC is followed by a gated multiband limiter optionally preceded by a multiband compressor. Optional single band gated limiting can be applied before the final clipper. Pre-emphasis for FM is applied partially before the multiband section and partially after the final clipper.

- Within each processor is a 'failsafe' function that will switch the audio to a backup feed should the main feed fail. The backup can be simply the sound file player playing a repeating playlist.

- A stereo multiplex generator and RDS encoder for FM use. This feature needs a 192kHz sound card with adequate bandwidth to pass the multiplexed signal.

- LAN or Internet linking to a remote computer (STL function). The link can send feeds to multiple clients. The link is optionally bi-directional. The encoder uses Ogg/Vorbis achieving an FM like quality at 64kb/s.

- Audio logging function.