If computers are compact and $25, we’re talking a very different world of music hardware. Armed with the popular Raspberry Pi, Servando Barreiro has made an incredibly-affordable, ultimately-customizable rig with free software and the open source community. Oh, and he’s made the KORG monotron polyphonic – after a fashion. See video at top for some beautiful chords. And that’s just the beginning. We’ll let Servando share how he’s working.