I highly recommend to NOT change the values in the INI since there are some limits that needs to be respected,
but if you really want go ahead.

-- Explosion Tinnitus --
ExplosionTinnitusEnabled = true -> Enabled = true, Disabled = false
Duration = 10 -> Duration is in seconds, minimum value is 0 maximum is 20 (for the ExplosionTinnitus.mp3)
Volume = 0.5 -> Minimum is 0, maximum is 1
FadeTime = 1500 -> Duration is in ms, minimum is 0, maximum 5000 (1000ms = 1 second)
Distance = 20 -> Maximum distance to get tinnitus, in-game units, minimum value is 1, maximum is 50

; -- Gun Tinnitus --
GunTinnitusEnabled = true -> Enabled = true, disabled = false
GunTinnitusDuration = 10 -> Duration is in seconds, minimum value is 0 maximum is 10 (for the GunTinnitus.mp3)
GunTinnitusVolume = 0.35 -> Minimum is 0, maximum is 1
GunTinnitusFadeTime = 2000 -> Duration is in ms, minimum is 0, maximum 5000 (1000ms = 1 second)