My piece "8 bit larynx" being performed at the NetVoTech concert (which was all about the musical use of voice+technology).
In this piece I use my voice directly to control an emulated ZX Spectrum 128 sound chip.
For technical details of the "timbral remapping" process I use in this piece, please see my research paper at http://tinyurl.com/2rf9ue (there's also a video lecture: http://tinyurl.com/3buzq9 ).