If you do see the problem, the same fix as in FO3 likely applies:
http://www.fallout3nexus.com/downloads/file.php?id=9606
I've verified that this does work. However, I've also had other games (one, but it's a possibility) stop working correctly after implementing this.
Fortunately it's a quick toggle!
--- fix info below ---
Notice
======
I do not take any responsibility of making this DirectShow filter. All copyrights belong to the author of this file Armin Gerritsen.
Description
===========
This file fixes the general radio stutter problem.
Quote from the mainpage of the project:
"This is a DirectShow filter for the MAD library. The idea is mostly to provide an example on how to write a DirectShow audio-filter, however the filter itself can be used as a replacement for the standard MPEG Audio Layer 1, 2 and 3 filters."
Also if you are using FFDShow, I recommend you to disable FFDShow for running the filter more effective.
Install
=======
1. Extract MADFilter.ax together with register.bat to any folder (for example Windows\System)
2. Run register.bat or, if you put the filter into Windows\System, type in a console, or via Start -> Run: "regsvr32 MADFilter.ax"
Uninstall
=========
1. Extract unregister.bat to the same folder as MADFilter.ax and run it. Or, if you put the filter into Windows\System, you can also type in a console, or via Start -> Run: "regsvr32 -u MADFilter.ax"
2. Delete MADFilter.ax
Credits
=======
Copyright © 2002 Armin Gerritsen
(Armin.Gerritsen@hetnet.nl)
Licensing/Legal
===============
This mod is released under the GNU General Public License.
The GPL can be found here: http://www.gnu.org/licenses/gpl.txt
Homepage
========
http://sourceforge.net/projects/maddxshow/
http://maddxshow.sourceforge.net/