Sound attenuation for FS2020 Arrow
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Did you check the Headset simulation option in the Audio settings of MSFS?
I think it does exactly that.Note that the Turbo Arrow seems to have an issue with the engine sound with this option enabled, but I'm sure it gets solved with an update at some point:
https://community.justflight.com/topic/2244/sounds-seems-so-flat/8