Created a documentation page for the pulseaudio_loopback switch.

source/_components/switch.pulseaudio_loopback.markdown

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+---
+layout: page
+title: "PulseAudio Loopback Switch"
+description: "Instructions how to use Pulseaudio loopback modules to build a flexible whole-home audio system."
+date: 2016-03-22 21:00:00
+sidebar: true
+comments: false
+sharing: true
+footer: true
+logo: pulseaudio.png
+ha_category: Switch
+---
+
+
+The goal behind this switch is to allow a very flexible whole home audio system based upon PulseAudio.
+
+For example, for a system with a 7.1 surround sound card, and 3 instances of mpd running, it is possible to quickly route the output of any mpd instance to any of the 8 possible (4 stereo) channels on the sound card, by loading/unloading a loopback module.  This loading/unloading functionality is provided by this component. When the switch is 'on', the loopback module is loaded.  When the switch is 'off', the module is not loaded.
+
+The benefit of this approach is that this audio routing can occur without modifying the design-time configuration of mpd or PulseAudio.
+
+This component uses a TCP connection to control a local or remote PulseAudio server- so there are no local dependencies.
+
+To enable this switch, add the following lines to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+switch:
+  platform: pulseaudio_loopback
+  name: mpd1 -> bedroom
+  host: 127.0.0.1
+  port: 4712
+  source_name: mpd1.monitor
+  sink_name: bedroom
+```
+
+Configuration variables:
+
+- **sink_name** (*Required*): The name of the Pulseaudio sink that will recieve the audio.
+- **source_name** (*Required*): The name of the Pulseaudio source that will supply the audio.
+- **name** (*Optional*): Name of the switch.
+- **host** (*Optional*): The IP address or host name of the PulseAudio server.  If not specified, 127.0.0.1 is used.
+- **port** (*Optional*): The port that Pulseaudio is listening on.  Defaults to 4712.
+- **buffer_size** (*Optional*): How much data to load from Pulseaudio at once. Default is 1KB.
+- **tcp_timeout** (*Optional*): How long to wait for a response from Pulseaudio before giving up. Default is 3 seconds.
+
+<p class='note warning'>
+This component relies on raw TCP commands to PulseAudio. In order for PulseAudio to accept commands with
+this component, module-cli-protocol must be loaded on the PulseAudio server.
+</p>
+

source/components/switch.pulseaudio_loopback.html

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+<script>document.location = '/components/switch.pulseaudio_loopback/';</script>