|Downloadable via the Homebrew App Store|
U-LiveSynthesisU is an application that utilizes a USB keyboard to produce music much like that of an electric piano.
Just a bit of a proof of concept; it's live sound synthesis on the Wii U!
This program actually generates all the sounds it makes on the fly. Previous stuff on the Wii U played audio files (mp3s and things) but here I've shown that you can also generate these sounds as you go. It uses kbd.rpl for USB keyboard support (thanks @rw-r-r_0644 for making this possible!)
Once the app starts up, connect a USB keyboard and start playing! The middle row of keys (asdfghjkl) are your white notes; some of the upper row (wetyuop) are your black notes. Z and X control the octave of the notes and C changes the waveform (sine, square, sawtooth or triangle). HOME on the gamepad quits; don't press A!
We can add sound to emulators using the techniques in this program. Generating the waveforms of a retro console no longer requires messing with audio files; you can just make it as you go!