On Thu, Mar 4, 2010 at 4:48 AM, Jonathan Gazeley
<jonathan.gazeley(a)bristol.ac.uk> wrote:
http://www.patentstorm.us/patents/6394875/description.html
this is an available product, too. its not based on cadence, just wheel rpm's.
a google for "bicycle spokes rear wheel sound engine simulated" gets
quite a few similar hits.
--p