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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Charles Bruno Jr commented
Please make it simpler for My Media multi room audio to operate properly
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Raymond Holtz commented
Please give us what we want Amazon...Multi room My Media on Alexa.
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Michael F. Stratton commented
Please add this feature.
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Familie Tiffert Naumer commented
Yes, please add multi-room local streaming for the MyMedia skill, the same as I use for streaming TuneIn radio stations.
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Pere commented
Please add this feature
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Gary E. Hoffmann commented
It would be great to have 3rd party apps have this ability. It is very frustrating to not be able to use MyMedia on a multi-room group without a crazy work-around.
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Joseph Caputo commented
I would love to see the multi-room feature added so that My Media skill may play to a specified group.
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Roger commented
Hello, please add this functionality.
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kurt commented
apple music should also be supported without an apple music subscription
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Joseph Kesselman commented
It seems incredible that this capability isn't yet available to developers, but a websearch isn't finding it in APIs, "My Media", or anywhere else I've checked.
The docs claim:
The Alexa Music, Radio, and Podcast Skill API enables you to:
Integrate your service with Alexa so that users can play music, radio, or podcasts from your catalog on Alexa-enabled devices.
Integrate your service with Alexa features like setting music alarms, multi-room music, and more.
[...]but I'm not seeing an example of that integration.
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Kumar Kanetkar commented
Please add this, it will further differentiate Amazon from Sonos, especially when this allows album art to be seen on multiple speakers as well, where the Show devices are concerned.
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Bill Speaks commented
Please add this functionality
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Anonymous commented
Please add Alexa Multi Room streaming for My Media
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Deek commented
Please add this feature.
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Anonymous commented
Please add Alexa Multi Room streaming for My Media
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Derrickns commented
Yes, please add multi-room local streaming for the MyMedia skill, the same as I use for streaming TuneIn radio stations.
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Geoff Gardner commented
Please add this functionality - very helpful for those of us who want to play our own music collection in a specific room
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Julie187 commented
Please, please, PLEASE add the ability for multi-room streaming for third parties that use the AudioPlayer API as it would enhance my user experience not only for the playing of my favourite music, but also of recordings of educational lectures. Thank you 🙏🏽
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Derrick Larson commented
Please add this functionality
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nathangunn commented
Please add this feature.