Cant figure it out

Just spent the $3 for the pro version because I simply wanted to lower the volume of an mp3 on my iPhone and then save the quieter copy to my phone. No such luck. Apparently through a convoluted process I can save to my PC (but not my phone), and then go into the apps tab for my phone in iTunes, then save the file to my desktop, then copy it into my iTunes PC music library, then sync that into the iPhone music library. So I did all of that, and then when I finally got the new file open, the volume was no different and was still as loud as ever.
Not impressed. Can I get my money back?

SmilingBag about Micro DJ Pro - Party music audio effects and mp3 songs editing, v1.0