as pulseaudio is run as the logged-in user, the fix is to also run mpd as the logged-in user, which is what will happen automatically if you disable mpd as a system service and provide your own ~/.mpdconf - see README.Debian for details
as pulseaudio is run as the logged-in user, the fix is to also run mpd as the logged-in user, which is what will happen automatically if you disable mpd as a system service and provide your own ~/.mpdconf - see README.Debian for details