My personal opinion- there are two types of "O" hobbyists (regardless of DC/2 rail or AC/3 rail), toy train enthusiasts, and model railroaders. Neither is better than the other- but you appear to be a toy train enthusiast from the amount trackage vs. scenery. So I think ballasting would be a nuisance, and ruin the toy train effect of the layout. I think this, regardless if it had any effect on sound.
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