Kai-Uwe Weiss wrote on Feb 9^th, 2018 at 4:19pm:

Hm... I have to check every row because I don't know which line is for what sound, especially files like BUT or GL. Is there a kind of checklist which block (sound.1, sound.2...) is used by which switch? Maybe a graphic ui where I can find a description at the left and a corresponding slider at the right would be very nice but I'm not sure if I ask for too much.

I think that the first line gives a clue as to where the button is:

[Sound.335]
;O01_001_BUT
File=BUT_4.wav
Id=2501001
Volume=0.05

Looking at the ‘757 Captain III’ Manual Part II – Aircraft Systems (CS757CAPTAINIII_MANUAL_PART2.pdf), O01 is the INERTIAL REFERENCE SYSTEM on th OH panel, so that will be the sound for one of the buttons (button #1?) on that panel.