FMOD slowing down datarefs?

[Ubbi]

Hello,
i have been working intensively in fmod in the last few days and so far i have achieved results that are actually very satisfying.
However, I have now encountered a first minor problem. I try to implement rain sounds.
See here:

Unfortunately the weather changes in X-Plane immediately without a smooth transition. Do you know a possibility in fmod that the parameters are taken over with a longer time delay? When the weather changes from precipitation to no precipitation I want the rain to stop slowly.

I have written my own little "rain script" over xlua, which creates a new dataref and "follows" the actual precipitation with a delay.

----------------------------------- LOCATE AND/OR CREATE DATAREFS -----------------------------------
precipitation_on_aircraft_ratio = find_dataref("sim/weather/precipitation_on_aircraft_ratio")
delay_precipitation = create_dataref("sim/weather/delay_precipitation", "number")
precipitation = create_dataref("sim/weather/precipitation", "number")
precipitation_direction = create_dataref("sim/weather/precipitation_direction", "number")
----------------------------------- RUNTIME CODE -----------------------------------

function before_physics()
	if precipitation_on_aircraft_ratio <= precipitation then
		precipitation_direction = -1
	else
		precipitation_direction = 1
	end
	if precipitation_on_aircraft_ratio > 0 then
		delay_precipitation = precipitation + (precipitation_direction * ((SIM_PERIOD / 6) * precipitation_on_aircraft_ratio))
	elseif precipitation >= 0.01 then
		delay_precipitation = precipitation - (SIM_PERIOD / 3) * 0.1
	else
		delay_precipitation = 0
	end
end

function after_physics()
	precipitation = delay_precipitation
end

Now I could achieve the following result:

But I feel it is a waste of resources to run extra xlua scripts for such small things like smoothing the change of the intensity of the precipitation.
Does anyone of you have a good idea how to do this in fmod without external scripts?

Thank you very much and best regards
Philip

 

 

Edited April 30, 2020 by Ubbi