Nokia DJ Mixer
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The Karaoke function seems fun!! Now I'm not gonna play my mix because my voice sounds like crizzap!!
You can load your own MP3 from your device and record and save your own karaoke tune. Unfortunately I got a java error when trying to listen to what I recorded... maybe that was a way of saving me from myself, lol.
All in all the app seems kind of fun, and paired with some stereo bluetooth headsets you could really have some fun.