You can mix several audio fragments from audio and video files:

1. Add several fragments into Vidmex Wizard's list by using Begin / End buttons. Or select and mix all files from playlist - press Ctrl+A and M key.

2. Press Mix video and audio button.

3. Enter file name, and choose Mix only audio streams. Select MP3 or WAV.

4. After that, select audio compressor and audio parameters. For MP3 - MPEG Layer-3 is selected automatically, for WAV - use ADPCM, PCM, WMA etc. Press Extract.

All audio streams will be mixed from the beginning of the file. Duration of the mixed file will be equal to the duration of the longest source file.

You can mix: ANY directshow supported video and audio types of files:
FROM: WAV PCM, WAV compressed, MP3, WMA, AVI, MPEG, ASF, WMV etc.;
TO: WAV or MP3.

Please note, audio and video fragments are mixed from the beginning of the selected fragments. Duration of fragments may differ from each other.