John Denker wrote:
> There is a huge element of arbitrariness and artificiality in the
> whole exercise, because few gamers are going to turn up there
>   
...
> Again, fiddling with the gain is tantamount to fiddling with
> the reference distance
...
> None of this "reference distance" stuff has any applicability inside
> the cockpit.  Engine noise _fills_ the cockpit.  Moving your hea

You are of course, right.  The more I think about it, the more I see how 
really arbitrary and subjective it just has to be because of all the 
variables that we can't possibly accommodate, and it comes down to 
"fiddling with essentially arbitrary numbers until it sounds good", if 
the end result is the same, it sounds good, what does it matter in the 
end (FlightGear is not an audio-sim, sound is just to enhance the 
immersion so at the end of the day, it's ear candy and what works, 
works, I think people would agree).

I'm also thinking that (especially for engine noise) basing both the 
in-cockpit and outside of cockpit sounds on the same file (as most 
present aircraft will do), is perhaps not ideal in producing "good" 
sounds for both environments, there is just so much difference 
(especially if you bring headsets into the equation!) that all the 
number juggling, pitch and volume changing in the world is not going to 
really sound right for both environments, and that this is most 
pronounced in the flyby, were pitch and volume changes are most applied. 

I'm going to do some experimenting with trying different sound sample 
for inside and outside, or maybe even different sounds specifically for 
fly-by (and tower) views - totally non GPL and thus not-commitable 
because I'm just going to try ripping sound from youtube video(s) but I 
think it will still be a worthwhile experiment [of course, nothing to 
say I couldn't approach the publisher to see if they will GPL the sound 
for us if it worked I suppose].

What would help though, is if there is some way to reload the sound.xml 
file without actually restarting FG, so I could tweak numbers on-the-fly 
as it were, it's difficult to say "adjusting this value makes it sound 
better" when you are interrupted by restarting between times.  Can 
somebody tell me if it's possible to do this?  Ideally, FG would watch 
the xml file for modifications and reload it the second I change it.

PS: My original question was regards volume changing to assist 
convincingness of doppler shifting, and I can confirm that, completely 
subjectively, when I set reference-dist and max-dist for the Hunter 
(with suitably guessed and adjusted values) I think it did help the 
doppler sound "better", and made the tower silent when the aircraft was 
suitably distant (quiet but noticable from the tower with the aircraft 
at the threshold of 28R at SFO, as one would expect).

---
James Sleeman

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