Mnnnrrrrrrrr.... I'll reply to this more fully when I haven't just spent 13 hours in a technical rehearsal... Basically, there are two essential models, and the truth is a bit of one plus a bit of the other... 1) The 1/r^2 thing refers to ray propogation, and is pretty much true for the propogation of the initial impulse (less so for lower frequencies, and less still when the environment is small enough for the early reflections to arrive within 2 ms of the initial impulse, and thus be psycoacoustically indistinguisable). 2) You then have "diffuse field" calculations, i.e. reverb level in our terms, which is far less distance depentent. Am too knackered to go in to detail, but for a given frequency, you have: SPL = k x ((rate of emission-rate of absorbtion)/volume of space) (k is some constant) My recommendation would be to keep (1) for the playback of a sound, but for the reverb send level, make LEVEL = l / (m x (NumPort+1))^2 (l and m are also constants, NumPort is the number of portals the sound has to pass through to get to the player. Will go to bed, then repost...
