# How can an app observe TV (master) volume changes on webOS TV Lite 8.3.0

**URL:** <https://forum.webostv.developer.lge.com/t/how-can-an-app-observe-tv-master-volume-changes-on-webos-tv-lite-8-3-0/28291>\
**Category:** Web App Development\
**Created:** [July 21, 2026, 3:33am UTC](https://forum.webostv.developer.lge.com/t/how-can-an-app-observe-tv-master-volume-changes-on-webos-tv-lite-8-3-0/28291 "2026-07-21T03:33:45Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![beerko](https://avatars.discourse-cdn.com/v4/letter/b/48db29/32.png) [@beerko](https://forum.webostv.developer.lge.com/u/beerko)\
**Post date:** [July 21, 2026, 3:33am UTC](https://forum.webostv.developer.lge.com/t/how-can-an-app-observe-tv-master-volume-changes-on-webos-tv-lite-8-3-0/28291/1 "2026-07-21T03:33:45Z")

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My app shows a volume indicator and needs to stay in sync when the user changes  
the TV volume with the remote or Bluetooth headphone buttons.

Device: webOS TV Lite, release 8.3.0 (Core OS Rockhopper 8.3.0-915, firmware  
built 2025-08, manufacturing version 03.33.46).

What I found on this platform:

- The documented Audio API (`luna://com.webos.audio`) only offers `volumeUp`,  
`volumeDown` and `setMuted` — control methods, but no way to read or observe  
the current level.
- `getVolume` does respond (undocumented), but a `"subscribe":true` call, while  
accepted (`"subscribed":true`), never delivers change events — and the service  
unloads after a short idle period, taking the subscription with it  
(“com.webos.audio is not running”).
- `luna://com.webos.service.audio/master/getVolume` (documented in webOS OSE as  
change-notifying) returns “Message status unknown” here.
- Settings Service `getSystemSettings` has no volume-related key to subscribe to.
- Volume keys are handled by the system and never reach the app’s input events.

Paired external controllers (LG Connect / SSAP clients) clearly do receive  
volume-change notifications via `ssap://audio/getVolume`. Is there a supported  
equivalent for an app running on the TV itself — on webOS TV Lite specifically,  
or on webOS TV in general? Or is polling `getVolume` the intended approach?

If no such API exists today, please consider this a feature request: a  
subscribable volume/mute status for apps (e.g. a subscribe-capable `getVolume`  
or a Settings Service key).

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**Author:** ![narae0.kim](https://avatars.discourse-cdn.com/v4/letter/n/87869e/32.png) [@narae0.kim](https://forum.webostv.developer.lge.com/u/narae0.kim)\
**Post date:** [July 24, 2026, 2:39am UTC](https://forum.webostv.developer.lge.com/t/how-can-an-app-observe-tv-master-volume-changes-on-webos-tv-lite-8-3-0/28291/2 "2026-07-24T02:39:23Z")

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Sorry for the late reply. We do not guarantee the compatibility of webOS TV apps with webOS OSE resources. For webOS TV apps, please use webOS TV resources in this website only. Currently, no API is provided to get volume. Thank you.