I had problems getting overseer to work with in game speech, and after some time googling the problem and trying to figure it out, i finally managed to fix the problem. so i made a fix for it, and am now sharing it with you.

This issue fixes the problem of not having any speech in game.
I am assuming you are able to start Overseer, and can watch the intro video with sound..

this describes the problem:
when examining an object, or anything producing a line of speech, subtitles flash for only a split second and Tex doesn't say anything.

The main culprit is Intel's RSX 3d Audio system.
This is a software driver for recreating spatial surround sound.
it is included on the original discs, but it is not included in the gog version (unless it's hidden in the installer files)

now, RSX 3D was from '96/'97, and was absorbed into Miles in '99, so finding a copy of it is very hard as it has been discontinued for about 14 years now.. but i managed to find a copy of it.

now, after installing RSX 3D, i still had the same problem, and testing RSX 3D audio gives an error message.
the problem was that the DLL's are not registering during installation, so I had to register the dll's manually.

But, you won't have to.
just download my fix and i'll do it for you ;)

in this fix there are 4 files, the RSX 3D Audio installer, two batch files for registering the DLL files, and a registry key.
one batch file and the reg key are for x64 windows.

Download it here:
https://drive.google.com/folderview?id=0B8iyv1fbfVr3ODR3MUVpYmdfZkk&usp=sharing
(chrome may say its rarely downloaded or similar, just choose to keep the file.

there are no viruses.
The batchfiles and reg key are written in full below.

* RSX DLL fix.bat

@echo off
c:\
cd\
regsvr32 c:\windows\system32\aaudio.dll
regsvr32 c:\windows\system32\rsx.dll
exit

* RSX x64.reg

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\SharedDLLs]
"C:\\Windows\\system32\\AAUDIO.DLL"=dword:00000001
"C:\\Windows\\system32\\RSX.DLL"=dword:00000001

* RSX x64 DLL fix.bat

@echo off
copy c:\windows\system32\aaudio.dll c:\windows\syswow64\
copy c:\windows\system32\rsx.dll c:\windows\syswow64\
regsvr32 c:\windows\syswow64\aaudio.dll
regsvr32 c:\windows\syswow64\rsx.dll
exit

could a mod please add "in Overseer" to title of thread?

Thank you. However, it is not working yet. I installed the RSX 3d audio, then I had to register the DLL. As I have Windows 8.1 x64, I used that specific bat file.

When I double click that file I get a error message:

Module 'c:windows\syswow64.rsx.dll" is loaded but the call to Dllregisterserver has failed with error code 0x80040201.

Can anyone please explain what I did wrong.
Excuse my ignorance.

Thank you very much, works even in Windows 10 x64.

"Module 'c:windows\syswow64.rsx.dll" is loaded but the call to Dllregisterserver has failed with error code 0x80040201. "
Run .bat as administrator.