Audio Blender 2.7

Allows you to apply an array of functions, conversions, add effects and filters all in one whack - transform one or a hundred audio files all at once. Never alters the original files but rather creates and saves new transformed files within the target folder you set.

Accepts input of WAV, MP3, OGG and WMA format: output to WAV and/ or MP3 with choice of many sample rates.

As you can see: this software gives you many, many options of conversion (to WAV and/ or MP3), many effects and filters you can apply (i.e. normalize, fade in/ out, echo, etc.), option to create albums, add audio (audio mark?) to front/ back or loop within the files to be transformed and much more...