Did you know that your DS could be used as a Metronome?
YES its possible =)
Homebrew : DSMetronome by Demented
Games : Warioware
either google for it, or get it from http://www.dcemu.co.uk/vbulletin/showthread.php?t=179844 or contact me at flubear@gmail.com to see if I still have the file ^_^
Northpaw 
“Amazing! This blog looks just like my old one! It’s on a entirely different subject but it has pretty much the same layout and design. Outstanding choice of colors!”