To have more advanced feature like selecting mono, stereo, and joint stereo. Have a DSP function like volume normalization. Also have a preset setting for every device like appropriate settings for phone, psp, etc. Not all the time you convert audio

To have more advanced feature like selecting mono, stereo, and joint stereo. Have a DSP function like volume normalization. Also have a preset setting for every device like appropriate settings for phone, psp, etc. Not all the time you convert audio files, its much better to have a portable version of this software.