I recently acquired an Quicksilver 800MHz DP and its great, handles Leoard like a champ 
BUT how I have it set up is the analog audio out (headphone jack)from the G4 into my TV's audio line in (another headphone jack) and from the TV a pair of headphones. Reason I do this is because I have 4 PC's connected to my display so it is sheer convenience otherwise I would be unplugging my phones from the back of each PC everytime I wanted to use a different one, and I need to switch to different machines all day.
Whats weird is if I plug my phones into the Mac directly its clear as a bell, zero static but as soon as I connect the Mac to my tv via male-male analog jack, boom static. After some googling I read that it could be due to the interneal speaker not disablijng unless you plug headphones directly into that jack which would make sense out of my situation so I disconnected the internal speaker from the logic board altogether and still....static
BUT how I have it set up is the analog audio out (headphone jack)from the G4 into my TV's audio line in (another headphone jack) and from the TV a pair of headphones. Reason I do this is because I have 4 PC's connected to my display so it is sheer convenience otherwise I would be unplugging my phones from the back of each PC everytime I wanted to use a different one, and I need to switch to different machines all day.
Whats weird is if I plug my phones into the Mac directly its clear as a bell, zero static but as soon as I connect the Mac to my tv via male-male analog jack, boom static. After some googling I read that it could be due to the interneal speaker not disablijng unless you plug headphones directly into that jack which would make sense out of my situation so I disconnected the internal speaker from the logic board altogether and still....static