Aeal: Directsound actually used identical code to play music, so it probably has the same problem...
Border: if anyone plays your game with Directsound on Vista, it probably just won't have audio. XAudio2 works on both XP and Vista. Also, looking further forwards to Windows 7, it will also not support Directsound, and WILL support XAudio2.
So I've been trying to get everyone to use XAudio2 as soon as I figured that out, because a year or two down the line, Directsound will be seriously useless.
Would anyone be affected if Directsound was omitted from an upcoming build, though? At the latest, I want it omitted from the 1.0 release.