Add more group info

docs/audiopipeline.md

@@ -36,3 +36,6 @@ Also of note in this example is the icon shown in the input section where the co
 The view will expand as necessary to show all [grouped players](faq/groups.md). In the example above three players are shown with a variety of filters, output qualities and player types.
 
 A point to note in this example is the orange dot beside the third Output section label. Whilst no quality would have been lost due to the Output Limiter or [the upsampling to 48kHz](https://www.youtube.com/watch?v=tIIK2wuXHuY) the change to the [lossy MP3 codec](https://www.adobe.com/au/creativecloud/video/discover/best-audio-format.html) necessitates the indication that this is now only Low Quality.
+
+When a group of players have the same pipeline then the identical output stages will be collapsed as shown in the following image. Note that in the case of Slimproto or AirPlay a different output pipeline per player is possible, whilst with other player types such as Sonos or Snapcast, the leader determines the stream sent to all the children.
+![image](assets/screenshots/audiopipeline-groups-collapsed.png){ width=500 }