Sound apps in Waldorf - volume keys

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http://crunchbanglinux.org – Hi, I am new CB user for a week a I am really happy that I met CB in my distro hopping. Runs excellently on my EeePC (Asus EeePC 1015BX) and will keep for a long time as my main OS (maybe forever?:-)). One and only problem I have is with volume keys (Fn+F10,F11,F12). After fresh install it works, but until I installed some gstreamer plugins needed for listening radios in Guayadeque player,  it stops working. I am still able to control volume by PNMixer icon in tray, but it is not so useful as keys control.So what is relation between alsa, pulseaudio, pavucontrol, PNMixer and xfce-volumed? (HowTos)