Hey-
I've been testing the new 3535 alpha's on my SMP/Audigy2 system, and I've been experiencing lockups in varios games (BF1942, Unreal, Call of Duty). At first, I thought this was because I attempted to enable hardware/EAX sound, but I still crashed when starting a game (BF1942). Otherwise, audio playback at 24/96 works flawlessly. Let me know if there's a debug log or something I should post.
Oddly enough, I tried the 3D Diagnostic tools that Eugene Gavrilov posted in the 3-D forum, and I had no problems with either EAX or Harware settings.
-Ian