No, if you want to use iw_multiplayer.csv, you should use:
PHP Code:
gomplayersleft,,gomsound/playerdiscon.mp3,,,,,,,,local,streamed,,,,all_mp,,,,,,local 
And if you want to use it with your soundalias file with the columns you posted you should use:
PHP Code:
gomplayersleft,,,gomsound/playerdiscon.mp3,,,,,,,local,streamed,,,,all_mp,,,,,,local