Option to untie the mobile app sounds from the status of the desktop/browser app

The Android app does not notify via sound when users send me messages, if my desktop status is Online. The two status are essentially linked to each other. A great convenience in many times, BUT a great problem if the sound on my computer is malfunctioning ):-

Please add an option to un-tie the two, so that i can get the sounds on my mobile app, INDEPENDENT of the status on my desktop/browser.