Bring Multi-Room support to AudioPlayer API streaming
Alexa Multi Room streaming does not appear to be available for third party skills that leverage the AudioPlayer API.
Feature request is to extend support for Multi Room to the AudioPlayer interface. This could be implemented by adding a custom slot type for the multi room location and then adding an optional parameter to the Play() command to allow the destination room group to be specified.
This has 37 likes and 19 comments as of Mar 2018 on this URL but doesn't show up on this feature forum - https://forums.developer.amazon.com/idea/101848/bring-multi-room-support-to-audioplayer-api-stream.html - so posting again.

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Richard Lavallie commented
This is a real need for people who have their own private collection and don't need to pay a 3rd party for music. I have 22000+ songs and would love to stream it in a group instead of to one speaker only. Please add this so 3rd party Skills can use the functionality of GROUP targets.
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Scott McCune commented
Not sure if related but to me seems like this feature would also solve my use case.
I'd love to be able to add custom alarm tones to routines with multi-room support for the audio.
For example I have a routine with an alert that I want to play on every device because I don't know where I will be when it goes off. Currently I have two options: have Alexa make an announcement where she says something or play music on a multi-room music where I'm limited to amazon music, spotify, iheartradio, pandora, wtf etc.
I can not play an alarm tone which is what the skill I enabled to play Star Trek's red alert claxon comes through as.
What good is red alert if the whole house isn't in alert?
Additionally, would be nice to have multi-room audio for prime video, netflix, hulu, slingTV, youtubeTV, ESPN, etc. I'd love to be able to move through my house/deck and hear if I'm missing something happening in the football game I have on
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Jerry Gates commented
I have 6 Alexa devices and an Amazon Music Unlimited subscription. I really enjoy being able to listen to music throughout the house. I have a lot of music not available through Amazon. Enabling multi-room streaming would significantly impact my interest in continuing to use the Alexa platform and extending it's use to the rest of my family.
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Mark commented
This would be so useful
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Pete commented
Please add this feature.
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Luigi commented
Please add this ability
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Robert Dorr commented
Please add Multi-Room support for Alexa skills that include audio such as sleep sounds.
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Michael Friedel commented
Please add the Multi-Room support. This would have been a great feature.
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Cameron commented
Please add this ability
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Ron Bond commented
Streaming is great but ... I have built a music collection over the past 40 years. I shouldn't have to pay for the music multiple times. Please add multiroom for third party apps.
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Andrew R Mountford commented
Please can you add support for multi room streaming for 3rd party API's
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Mike B. Dalton commented
Please add multiroom capability for 3rd part apps.
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richard welker commented
Please add this capability
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Andy McCreddie commented
Would very much like to be able to use "My Media" for multi-room functioning with a simple command
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Jonathan Sleep commented
This is my MOST desired feature from Alexa after discovering Play Everywhere through Spotify. I'm an audiophile and have nice speakers all around my home, each with an Alexa attached (or by itself). The ability to play my content via aux input / media on my PC would be REVOLUTIONARY.
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Helena Fehr commented
Yes, I agree. This would be an awesome feature to have added. Please consider adding it in a future update soon.
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Alan Gornik commented
Let's get this done Amazon!
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Rhonda Sharpe commented
PLEASE add multi-room support for audio! I would like to be able to play My Media Playlists throughout my living area without so much effort.
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ROBERT WOODS commented
The lack of this feature - particularly since BBC radio withdrew their streams from TuneIn is preventing me purchasing any more Echo devices.
Please, sort this one out. -
A J Hawker commented
This would be such an excellent feature. Please consider adding it.