Rework the initial reverb decay

The idea here is that the initial reverb decay can't become less than the dry
path distance attenuation, as the dry attenuation represents the audio that has
not yet had a chance to start reflecting in the environment. As well, the
reference distance indicates where there is no distance attenuation, with any
initial attenuation set by the environment itself.

So what we do is use the dry path attenuation as the baseline for what's mixed
to the reverb, with the decay rate indicating how much of the remaining room
(non-direct) energy attenuates with distance.

This may be over-complicating it. Other sources hint at a more typical XdB per
doubling of distance, with X varying depending on environment properties (room
size, absorbancy, etc). This could be handled by applying a normal inverse
distance attenuation model, with a rolloff factor generated from the reverb
properties (density, decay rate, etc). Will need more testing and research.

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