Since there's a nerdy rPi post at the top of HN, I'm going to take the opportunity to plug my new baremetal midi file player / lv2 audio plugin host:

http://www.joebutton.co.uk/blog/baremetal-midi-lv2-raspberry...

When I get time I want to connect up a MIDI keyboard and audio input, so it becomes a synth / guitar stompbox that'll use an open audio plugin format.