He has contributed to this thread so this is the right place to ask.
heās German isnāt it? #GrĆ¼ndlichkeit
I donāt know exactly where @Joerg_Schwieder is from but he is the one who communicated here. 
So, Iām bit confused about this topic.
Am I right in thinking we may be about to see a way of using iOS devices as Roon endpoints/zones - albeit connected to Roon Core using their squeezebox implementation, and through a third party app written by ipeng?
If so, how is this possible? I thought from earlier discussions with Roon that they didnāt think it was possible to use a secondary piece of player code themselves to get around the Xamarin limitations?
In any event, if itās turns out itās possible, this is great news!
(Or perhaps Ive completely misunderstood?)
I suspect yes to above. Ipeng can emulate a hardware squeezebox, Roon can stream to a squeezebox. So it seems plausible.
p.s. Im a longtime user of ipeng. Best value ever for me in audio related purchases.
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and thatās why grĆ¼ndliche German manufacturers like https://www.abacus-electronics.de/catalog/product/view/id/165/s/aroiosu/category/58/?___SID=U
persist including Squeezebox/iPeng in their products.
Garym, as an iPeng user I completely agree! 
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I was a long time LMS/iPeng user before turning to Roon. Canāt wait to see this happen!
Yes, Iām from Germany. Berlin.
@hifi_swlon
iPeng is not written using Xamarin but uses Appleās native environment and native iOS APIs (technically Xamarin is also using native iOS APIs but itās not using Appleās programming languages/compilers and therefore has some limitations you donāt have with purely Apple-specific code).
Another iPeng user here - great program! Joerg - while youāre at it, please explain to Roon development that itās not impossible to incorporate a simple WoL function into oneās app
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actually, every iphone since the 6 has had a 24 bit dac.
Ah, good to know. But AirPlay is still just 16 bit AFAIK. But as I said: thatās probably good enough for raw data transfer, the DAC in the iPhone probably also handles volume control and you do want more than16 bit for that.
But my experience with ipeng is that it stops playing if I switch focus to another program, such as the Roon remote, or Safari for that matter. Isnāt that right?
While it plays audio? It should not do that. Only if another App requests foreground audio, then iOS will get a signal to stop playback by iOS.
Works well with the Roon remote in my beta, the current App Store version doesnāt work well with Roon because of the way Roonās Squeezebox emulation sends status updates.
Weāll have a fix soon.
If you are talking about running the App while not playing audio please read the discussion above.
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Thanks for the update. 
For those who donāt have a Squeezebox, will Roon eventually play music through iOS devices? I have Roon with Bluesound and would simply like to listen to Roon-controlled music (stored on an NAS) on my wireless headphones, which connect to my iPhone by Bluetooth. Thanks.
There are two topics to consider in your question:
First, will the Roon IOS client be able to support audio playback? This has been addressed by the folks at Roon - unfortunately the cross platform development tool used has an issue with this capability on IOS (Xamarin, now owned by Microsoft). When and if Xamarin fixes this, Roon should work as it does on Android. There are a few threads on this if you want more info.
Second, can iPeng stand in until Roon supports IOS? iPeng is a wonderful app used in the Squeezebox/Logitech Media Server environment. If @Joerg_Schwieder is able to work his magic, it is very possible that you will be able to āEnable Squeezebox supportā on the Roon server, purchase iPeng in the app store, and be happy 
You would not need a Squeezebox ā¦
My fingers are crossedā¦
iPeng 9.3 with the Roon playback support is now rolling out on the App Store.
Iāll write a bit of a bigger announcement in the coming days but just wanted to let you know here since this has been going on for quite a while.
Please let me know how it works for you.
Just to be clear in case you donāt have iPeng, yet: youād need both the App (iPeng 9) and the āPlaybackā In-App-Purchase since iPeng is essentially not a player app but a Squeezebox remote control app.
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It works.
Iāve been an iPeng user for a long time and itās the app that made LMS work so well for me over the year. When I bought my Roon subscription I really missed the iPad playback that iPeng provided. I am so happy that it works so well now. I can now listen to music throughout my farm.
Many thanks Joerg.