Hi Guys,
If you are interested in hardware extensions, look here:
http://www.gechologic.com/diy-kits-guideIt explains MIDI, in case you want to add it using commonly available elements.
Also, the last picture shows all soldering pads. For more information, you might want to check out the STM32F405RGT6 datasheet:
en.DM00037051.pdfAny questions welcome!
