I dunno what to tell you about the Gravis Gamepad, sorry. I use a PS2 controller with a USB adapter. http://www.xgamegear.com/cvtps2usb.html
They are so worth it. I was never a fan of using my keyboard and the PS controller is the best controller ever designed IMO.
The Xbox 360 controller owns any Playstation controller hands down. :icon_wink: I used to play Madden 07 on the PC and I ordered a controller adapter so I could use my PS2 controller, but it didn't work... So I used my keyboard and I owned on it. :icon_cool: