Ecco la risposta di Miska:
This is precisely on purpose.Pressing STOP in HQPlayer, the audio card is not released by the player.
Correct way if you want to release the audio device is to exit HQPlayer.This creates some problems when there is more than one player on the NAA, for example squeezelite (or MPD) and NAD.
If I play squeezelite, then stop in LMS, squeezelite leaves ALSA free. MPD is the same.
On the other hand, if I play NAD, then stop in HQP, it does not release ALSA till I open audio card setting and close it. Alternatively, HQPlayer has to be closed.
No it doesn't, ASIO driver is still initialized and loaded. If you do something else meanwhile and mess with the audio device settings, the settings may end up being something else than HQPlayer thinks they are. For example when HQPlayer sets the sampling rate, it expects that to stay and things get seriously screwed up if some other application changes the rate behind HQPlayer's back.With Windows NAD it does not happen. Pressing STOP in HQP, NAD releases audio card.
Do not ever run anything else touching the audio device when HQPlayer is running, regardless of OS or whether you use NAA or not! (if you do that on Mac, you'll likely need to reboot OS X to recover)