Nanoloop lets Gameboy Advance users make electronic music.
The new version, Nanoloop 2.0 is optimized for the Gameboy Advance (GBA). Nanoloop is a stepsequencer and synthesis package with a minimalistic and easy to use graphical interface. The Synthesizer supports 8 voices with freely assignable sound type. The sequencer supports 8 tracks with 1 to 16 steps. Besides normal line-recording, nanoloop also allows to transfer song data digitally through the audio port by playing a chain of rectangular pulses which represent song data bytes stored in the cart memory. These pulses can be decoded by a PC client software and then stored in the same format as on the cart - Cool!
There are some sound examples on the nanoloop site. Nanoloop 2.0 cartridges are currently out of stock on Nanoloop.