Homasote or ceiling tile work pretty well, are easy to find and cheap. Filling the underside of the track with silicone would be almost more expensive than purchasing new track, I wonder if plaster of paris could be used may not be AS effective but cheaper. Just putting the track down on homasote then caulking the edge down will help a lot. The caulk at the edge could be covered with roofing minerals or dirt while it is wet than vac up the excess once it is dry to cover that seam.
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