Sonos4 3.5.1 was available to download from the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The program lies within Multimedia Tools, more precisely Music Production. This free program was originally developed by Sonos4. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software.
From the developer:
Sonos 4 central feature is a state of the art software multiband compressor limiter (MBL9) for radio broadcasters. With this software and a suitable sound card it is possible to turn a Windows PC into an radio broadcast processor. The processor achieves its punch (loudness) through the use of a unique distortion masked final clipper. The software is for all forms of broadcasting such as AM,FM,DAB and Internet streaming.
You may want to check out more software, such as Remote Request System - Server, NRV10 interFX or Devine Machine V-Minion VST, which might be related to Sonos4.