Chicago-based Sensaphonics talks up its Musician's Earplug, which has an embedded filter which allows you to cut volume with flatter response. There are different filters that can be used, from a 9db to 25db cut. The Gearwire demo video has all the information including details on custom molding, and more. Gearwire's Rob Warmowski puts the questions to the Sensaphonics rep on the floor of Winter NAMM, 2007.