Alan,

Oop's......I mean: Your best post ever.

It's nice to know the sonic advantages of MDF.........rather than someone saying "it's cheaper than real wood".
The "Hardie board" is a mixture of concrete powder and wood, a more durable material for exterior panels, than T-111 siding...which is moisture prone, etc.

LIFE: "Choices, balance, and timing"

(Larryism)