I recently came across this website http://www.indirectsound.com, which is an app aimed to support old d3d/eax games. I tried it, and it did create a log file indicating that it is loading when FA launches. While spatial sound option still can't be enabled. I did enable the 7.1 surround on my headphones ( that would normally cause the same issues as enabling spatial sound) and with this running everything sounded normal. Enabled virtualization in enhancements, and everything still sounded normal.
I do not have a set of surround speakers currently to test out, so i can't test any speaker options beyond stereo, but perhaps someone can report back and see if this works?
Didn't work for me sadly. With the "dsound.dll" placed in (\Program Files (x86)\Steam\steamapps\common\Supreme Commander Forged Alliance\bin) I still have the same issue with the Logitech G533. All the gamesounds are amplified. For example, when zoomed out, I hear all the ACUs building (in a replay).
Back to the stereo headset of my work