Higher pitch

What RadioBOSS version do you use?

In any case, checking your playback settings is the first thing to do: http://manual.djsoft.net/radioboss/en/playback.htm

If you use any DSPs or plugings, try turning them off. Also check sound card settings, if it has some of its own DSPs enabled.
 
Hmm... It should work fine with WASAPI too - can you please tell me what sound card you use?
 
Please update to the latest version (5.5.5.0), if that doesn't help, I suggest you to try another sound card.
 
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