Indeed, it is not a guarantee that the "sleep" will be exactly that long. In the code I'm not "sleeping" in any sensitive places, instead I'm relying on the cal

Indeed, it is not a guarantee that the "sleep" will be exactly that long. In the code I'm not "sleeping" in any sensitive places, instead I'm relying on the callback to the audio stream object, which just needs to finish before the next one starts (less of a timing constraint).