The music synthesizer lets anyone make music and you'll get more bang for your buck if you use KORG DS-10 Plus on a DSi rather than a DS. Playing the game on the DSi will get you 12-voice polyphony, four tracks for the analog synthesizer simulator, two drum machine and more. Additionally, up to eight units can be linked together to play music or exchange songs with on either the DS or DSi.
Check out the above video to get an idea on just what can be done with the music synthesizer.
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