hi steve,for the update, after the best pot tuned(only last track has some cracky noise) i did, i just leave it like that for few days, now it seems no noise at all, and the games which has no music somtime , now seems ok, no music rate get very low l think the situation is like hifi equipment that has not been used for long time, it need a period of time to hv the parts run in again:-) , i will hv my post update if any other situations come up, wish this can be helpful for turbo fans who hv cd reading issues:-D