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We describe the design of an untethered digital synthesizer that can be held and manipulated while broadcasting audio data to a receiving off-the-shelf Bluetooth receiver. The synthesizer allows the user to freely rotate and reorient the instrument while exploiting non-contact light sensing for a truly expressive performance. The system consists of a suite of sensors that convert rotation, orientation, touch, and user proximity into various audio filters and effects operated on preset wavedoi:10.5281/zenodo.3672997 fatcat:fvovyc6bkbh6lpid5jtwpntthy