From now you can change the following settings.
'chat' => array(
'online_timeout' => 300,
'back_office_sinterval' => 10,
'chat_message_sinterval' => 3.5,
'check_for_operator_msg' => 10,
'new_chat_sound_enabled' => true,
'new_message_sound_admin_enabled' => true,
'new_message_sound_user_enabled' => true,
These settings also can be changed from back office in
System configuration -> Synchronisation and sound settings
Developing application takes a lot of time. You can support application by donating. There is no company behind this application and it takes away my free time. Every donation matters and does not matter how small it is!