sound waves are oscillation of air molecules. those molecules get affected by gravity, but since they are very light weight, the force for single particles is almost negligible compared to their random movement at room temperature.
however on a statistical basis, gravity has the effect that the air close to water level is more dense than the air at certain elevation levels. mby that density difference counts as a gravity effect, even though i have no idea how sound waves change due to air density.
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