timing belts for long runs

Les,

My immediate application would be for less than 36" travel,
for longer travels the solution might be the two idler and drive
sprocket[pulley] arrangement with the idlers tensioning the belt
via radial springs. This way you could keep max desirable tension
or pressure of the belt on the driving pulley without trying to
stretch the entire belt.
what do you think??

By the way, when do you think PorterCable,DeWalt and the other guys
are going to do a "quiet" router like Makita's 82db model?

Carl