Advantages of having Sound card

What are the advantages of having a sound card?
I am using an On-board chip. I am having no problems whatsoever, and the sound is good. I have it connected to my Audio System so I really don't have to think much about the quality of the sound.
I'm thinking of getting a sound card that has a Joystick port. My PC doesn't have a Joystick port, but I have a joystick that doesn't support USB (Old MS Forcefeedback)
Any suggestions to what I can do?
Thanks
I am using an On-board chip. I am having no problems whatsoever, and the sound is good. I have it connected to my Audio System so I really don't have to think much about the quality of the sound.
I'm thinking of getting a sound card that has a Joystick port. My PC doesn't have a Joystick port, but I have a joystick that doesn't support USB (Old MS Forcefeedback)
Any suggestions to what I can do?
Thanks