Contant Peak, Constant RMS, How to get a fixed value for peak and RMS Options

[terataz]

Hi, we are trying to set a default standard for the volume of the audio files we are working on.
We are looking for a tool that, given a bunch of mp3 files, will be able to normalize them at a given db.

For example : 0db for Peak levels and -9db for RMS.

Ideally, we'd love to use sox as we can chain it with other effects we're using without the need to convert multiple time the file from mp3 to wav and back.

We tried sox gain -n , sox gain -ne, sox gain -nb, sox loudness but none of them keep a constant RMS without varying the Peak level as well.
Any help appreciated.
Thanks

[splice]

It looks like Francesco is building playlists for use in "muzak" type situations - restaurants, bars etc. His media options appear to include MP3 players, audio-only DVDs that can be played on a standard DVD player without a visual display, and music servers that can be updated automatically over the Internet. He wants to:
- Automatically classify tracks using parameters such as "tempo, pitch, loudness, signature, beats, key and so on".
- Arrange the tracks into playlists by genre etc using the above classifications.
- Use MP3 or AAC format to make the track files as small as practical.
- Process the tracks to a consistent loudness for each genre.
- Store the playlists in a format that can be accessed with a minimal user interface (a few buttons).

This post has been edited by splice: Dec 13 2012, 07:43