AU7 transforms ambiance-noise to a C-major scale.

A resonance-chamber receives sound waves and passes them on to 7 tuned  strings. An electro-magnetic pickup converted the string-vibrations into electric signals. The signals are amplified and passed on to a line-out, where headphones and recording-devices can be plugged in.

AU7 sits on wheels, which makes it possible to roll the unit to the operation site.