More people should put music on their 3DS. It can play really high quality MP3 files, up to 320kbps and 48kHz!
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I just don't wanna unscrew the back of my new 3ds xl lol
I prefer using a bluetooth speaker
What software do you use to play it?
I use 3DS sound to play music, as it's preinstalled on all systems. I use FTPD to wirelessly transfer the music over.