Hi. I'm running Final Cut Pro on a G4 PowerBook with 1G RAM and 1.5 processor. The video and audio playback is jerky and when I export, the video quality is very grainy and pixelated (much more poor than how it would look in iMovie for example). I'm new to the program. I just updated updated my ram from 512 hoping that would fix it. No luck. Can anyone give me some advice?