I'm having great fun with programs like NitroTracker on my DS, but it's just made me realise that there's a huge market for music homebrew on this little beauty of a touch-screened console! I'd really like to see some sort of sound modulation/effects programs, for instance, if someone was able to create a realtime effects program that could take sound in through the microphone, or samples from a memory card, effect it in the DS and then output it through the speakers/headphone socket. Anyone know if the DS is powerful enough? I'm thinking of current effect boxes like the Korg Kaoss Pad which is essentially a touch-sensetive effects box, where your finger (stylus) on the X/Y axis modulates the sound put through it. If someone could get something like that to work, that would be amazing.
My other thought is, as well as having the built in microphone, doesn't the DS also have a port next to the headphone socket for an external headset mic? Could this be hacked to accept sound in from an external source, say, an mp3 player or electric musical instrument? If a converter could be made to give the DS a line-in and then line-out through the headphone socket, and the sound manipulated in between, that would be awesome. Any ideas, anyone?