TODO List for kamix

- Check this: when you split a capture that has no channels (why _can_ I split?),
  actually the playback one is splitted
- KMixerSlider initialization is pretty bogus: to create channel sliders, it must not check
  only hasVolume(sense), otherwise it won't create mute buttons for those controls who has
  independent channels but not volumes (i.e. CD or Line): it must check hasVolume() for 
  sliders and !hasSwitchJoined() for mute buttons

