In Libratone App version

* 4.0 for iPhone
* 0.9.9-113 for Android

the volume control is missing when an analog or optical cable is connected to the speaker.

The following speaker models are affected by the bug:

* Classic Libratone Live
* Classic Libratone Lounge
* Classic Libratone Zipp 
* Classic Libratone Loop
* Classic Libratone Diva 

iPhone status

To bring back your volume slider - please upgrade to Libratone iPhone App version 4.01 released November 4th, 2015. 

Android status

To bring back your volume slider - please upgrade to Android App version 0.9.9-116 released November 22nd, 2015.