A number of other people are having the same problem and can be seen on Apple's Discussion boards with the problem of a macbook turning "deaf". I had the latest updates for my Macbook but the volume level for my MacBook was reduced considerably on update to 10.4.8. Update: Per the comments, this isn't new in 10.4.8, and it's applicable to only the MacBook and Mac Book Pro, it seems. I haven't had the chance to test it yet myself (audio chats in the household are frowned upon during the early morning hours when I'm working on hints!), but will do so later today. It seems this is definitely Intel-only it's nowhere to be seen on either my G5 or older 12" PowerBook G4. With this option enabled the sound seems to be a bit "softer" but more pleasant to listen to. Daniel tested iChat with and without the ambient noise reduction enabled, and wrote: Without this option the voice was clear but there was also a lot of noise from the MBPs fans and some static to hear. Audio chats (in iChat or Skype) seem like an obvious beneficiary, as but one example. It should make a difference in any app in which you use the microphone, making your voice clearer while diminishing unwanted noises. It appears that the ambient noise reduction feature is designed to remove the background noise that the microphone would otherwise pick up.
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