$Id$

- 4 new elements
  virtual-audiosink, virtual-videosink
  virtual-audiosrc, virtual-videosrc

- daemon that holds list of instances
- gui app that lists instances as mixing-desk like channelstrips
- channelstrips would contain
  - audio
    - volume, panorama, 3-band eq
  - video
    - brightness, contrast, alpha-level
- user can
  - add insert-fx
  - route channel to targets, where targets can be real sinks or more
    virtual-sinks (sub-groups)
- virtual sinks need queues to decouple application processes
- interfaces
  - expose child-elements via child-proxy
    - then e.g. the applications volume-control could directly access the
      channelstrip
  - state-control (play, pause/mute)
    - it would be useful if one app could pause/mute others
    - think of a voip-client, if there is an incomming call, if pauses your
      media-player, or mutes the monitoring of your recording app