Well, My guess is that nobody here is using directsound. Actually, I wouldn't recommend using it at all. Just read this:
http://en.wikipedia.org/wiki/DirectSound#Windows_Vista
Aside from being an awefull API to work with (as far as I've seen it), it is deprecated. Windows vista has a new audio stack that doesn't directly support the DirectSound drivers. It is still supported through emulation, but a lot of features won't work anymore. It doesn't really supprise me that nobody is interested in fixing this bug.
Overall, I think that OpenAL is a way better option. It has more features, better support and it doesn't suffer from these problems.
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