I use Music Maker HipHop Edition 4, when i recorded a vocal and exported it in mp3 I imported it to Audacity to make a song (i know I can do that in Music Maker) and after exporting it again as mp3 the whole track was skipping! even the vocal by itself.
You recorded vocal and saved in Mp3 format using Music Maker Hip Hop Edition 4. Not only Mp3 any other audio format exported by Hip Hop Edition should work fine in any other audio software.
After exporting you had imported the saved Mp3 in Audacity then you made a song AND RE-EXPORTED that in Mp3 format right? but the whole track was skipping even the vocal. This happened when it was on Audacity before exporting or after exporting,in both cases first of all if you should check the Mp3 saved audio from Hip Hop Editon by playing in Windows media player or Real Player. If that play without problem it means you are facing problem in Audacity.
I do use Magix products and do not face problem using saved audio in other audio software.