Thank You Steven for the fix and explanation.
Regarding DirecSounds outdated API, I use a quad speaker setup in combination with a 1st gen. Creative X-Fi soundcard, whith hardware acellerated multichannel surround audio capabilities. Especialy for Stereo music I use a setting called "Stereo Expand" which up-mixes to 4 and more channel audio, which sounds quite impressive.
Regarding WASAPI, unfortunately DirectSound and DirectMusic hardware interfaces to sound card drivers are obviously not implemented for that, at least on Windows 8. Which means, people with a hardware setup like me are dependet on DirectSound somehow, to being able make full use of their soundcard functionalities.
So far I understood it, if there occur no problems with 32 bit output, it should be used because it potentially can improve the audio output quality, right?
With kind regards.