Method and device for providing a plurality of audio files with consistent loudness levels but different audio characteristics

A device for processing an audio file to produce a plurality of modified equalized audio files with different audio characteristics but a consistent level of loudness comprising:

• a circuit for receiving an audio file and generating a plurality of equalized audio files, each of the plurality of equalized audio files being modified by the circuit to produce the plurality of modified equalized audio files for storing and playing to a user, the circuit modifying each of the plurality of equalized audio files by measuring an activity level of the equalized audio file against a constant to produce a loudness multiple, and the circuit multiplying the equalized audio file by the loudness multiple, wherein the circuit further synchronizes the plurality of modified equalized audio files for playback permitting the user to switch between the plurality of modified equalized audio files during playback.

A device for processing an audio file to produce a plurality of modified equalized audio files with different audio characteristics but a consistent level of loudness comprising:

• a programmed general-purpose computer for receiving an audio file and generating a plurality of equalized audio files, each of the plurality of equalized audio files being modified by the programmed general-purpose computer to produce the plurality of modified equalized audio files for storing and playing to a user by the programmed general-purpose computer, the programmed general-purpose computer modifying each of the plurality of equalized audio files by measuring an activity level of the equalized audio file against a constant to produce a loudness multiple, and multiplying the equalized audio file by the loudness multiple, wherein the programmed general-purpose computer is further programmed to synchronize the plurality of modified equalized audio files for playback permitting the user to switch between the plurality of modified equalized audio files during playback.