FasTrack is too loud. Any cure?

[Jumijo]

Ordinary cotton has proved to be the best way to lessen the noise. Simply take 2 drug store variety cotton balls and stuff one in each ear. The difference in what you hear will amaze you!

[Roger Bielen]

Fill the hollow with lead.

[gvdobler]

I know this has been covered, but I wondered if any new ideas have come up.

I have about 45 feet of Fastrack for a floor layout and it is very loud.  The layoout is set up on a thick rug that should do about as good as anything to absorb sound.  I can't imagine it on a hard floor.  It seems way too noisy for a permenant layout.

Vibration being the source of noise, I wondered if anyone has experimented with filling it with the house insulation out of a can that sets up hard.  Just using screws to secure it to a board does not solve the megaphone effect of the plastic.  I even thought about having a friend mill something like wood chair-rail that fit inside and then secure the slanted sides to that every 3-4 inches.

I know some some people don't mind the sound but it is way too loud for me. 

I like the smooth running and the look, but compared to tubular the noise is a huge drawback.