Identity of jacks on back of soundblaster live 24 bit card

​ Greetings: ​

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​ I have a soundblaster live 24 bit card on my E510 and I would like to know the identity of each of the four jacks on the back of the card. I can't make any sense of the symbols which look like wavey lines with an arrow leading out of each one. They are numbered 1 through 3. My dimension 4600 had a soundblaster live 5.1 card which had 5 jacks so I don't understand why one is gone now. I need to hook up my logitech 5.1 speaker system and want to understand what each jack on the audio card is for - otherwise, I will simply match the colored jacks of the speaker leads to the audio card and hope for the best. ​

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​ Thanks ​