I've installed slack, I'm using KDE and i came up with major sound problem... when an application uses the sound card and other app want's to use it too it has to w8 till the first stops and the sound are playesd from some queue evem if there souhld be silence... When I og to Control center and use sound system menu no changes can be saved due to error in KNotify... can You help me? IM linux newbie...?