PNMixer question

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http://crunchbang.org – PNMixer is the default volume (sound) control utility (with waldorf) which sits in the systray. Now, there can be set different mixers or apps to control the sound (by default it's pavucontrol).Now, when i set the audio output to a headset, i cannot control any longer the volume by the function key (fn+f6 thru f8), but only from within the relative mediaplayer or by rightclicking on the volume icon in the systray and then choosing volume (i.e. pavucontrol does it, but not volume = function keys or leftclick on the icon). It's like that - not working - functions would point to alsa in (HowTos)