Ok there is some changes.
1 Go into the sound folder
Client installation folder > sound > select the folder from soundpack you use)
Download the attached file (the zip file) and extract.
2 Open the settings.ini
Code:
# client connection connected
CLIENT_CONNECTION_CONNECTED_SERVER = play("neutral_connection_connected_server.wav")
# client connection disconnected
CLIENT_CONNECTION_DISCONNECTED_SERVER = play("neutral_connection_disconnected_server.wav")
3 Start your client and enable the sound
Settings > Options > Notifications > Client > Connection > Connected/Disconnected
Check the "Server" option
This sound line should appears.