Hey there,
i encountered several issues while playing fallout 3. first of all i had the notorious "radio stuttering", but i already fixed it due to fallout wiki.tesnexus.
=> Increasing size of audio cache and installing miscellaneous filters, like MADFilter didn't work at all - but installing ac3 filters and tell it to use "WaveOut" instead of "DirectSound" for my fallout3.exe finally fixed my issues.

From now on there is an other problem that needs to be fixed: I can't hear NPC's voices anymore. If i turn my ac3 filter settings back to "DirectSound" voices are working correctly again. And there we have the dilemma: I can either play with radio stuttering or without NPC voices. Additionally the WaveOut setting forces the game to crash randomly (didn't test that out for a long time)
I already tried to change the *.ogg files to be dedicated to Windows Media Player, but that didn't work. I hope you can help me out here, beause my google search (no NPC voices in touch with ac3 filters "WaveOut" sound setting) already reached its limits.

My system specs (Dell studio 1747 notebook):

Windows 7 64bit

Processor
Intel Core i7-720QM 1.6 GHz (Intel Core i7)
:: Mainboard
Intel PM55
:: Memory
4096 MB, DDR3-1333 MHz
:: Graphics adapter
ATI Mobility Radeon HD 4650 - 1024 MB
:: Display
17.3 inch 16:9, 1600x900 pixel, glossy: yes
:: Harddisk
Seagate Momentus 7200.4 ST9500420ASG, 500GB 7200rpm
:: Soundcard
IDT 92HD73C1 / 92HDW74C1 / 92HDW74C2 @ Intel Ibex Peak PCH - High Definition Audi Controller

MADFilters are still installed (Fraunhofer codec disabled).

Game (Fallout 3 GOTY) is patched to 1.7.


Greetings, Rise.