2.66 Ghz Intel Core dual processor, 4GB; When playing clips in timeline or library, or a sequence, audio plays clear if just using built in speakers. But if set playback out via firewire, or use "edit to tape" it is like FCP adds a layer of static on top of the audio. Video remains clear. Have used 2 different wires to rule out wire issue. Also the clips play audio fine via wire to deck on my laptop. Any ideas?