Maybe off topic, but I've always liked the idea of patching physical acoustic objects into modular synthesisers. Like spring reverb, but with arbitrary objects, like pianos... I never did get 'round to buying myself a sound bug... to me personally, if I get audio out of the digital domain, then it tends to be into the acoustic rather than analogue electric. Just a thought, but do you see a place for acoustic transducers in your system?