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One Possible EXPLANATION For Apple Wireless Keyboards Or Mice GOING THROUGH BATTERIES In A Matter Of Weeks is as follows: When you shut down or sleep your Mac, if there is a second Mac running at some distance away (up to 100 meters distance), and this distant Mac has bluetooth switched on...

No, it did not work: providing USB power continuously while the Mac sleeps did not solve the problem: the USB sound cards still remain "unmounted" after sleep, and I have to unplug them and re-insert to get them back. (Not all the time though, sometimes after sleep they do mount OK; I am not...

Hi MisterMe: Apologies for the rambling story. What I wrote was a bit of a mixture of a technical query; and a write-up, detailing to others this cheap way of getting extra audio in/out ports for the Mac. But I guess those details do not really belong in the tech support area.

That is a very good idea, eldiabloconcaca. Perhaps it is just the loss of USB power that (presumably) occurs during sleep that is the cause of all the problems. I will see if I can get a power supply form my USB hub; it does have a power in socket. Thanks.

HI I wonder if anyone can solve this one: I have several USB sound adaptors, which cost just a few dollars on eBay, and plug into your USB port to provide additional sound out paths on a Mac. These devices are tiny USB plugs that actually contain a digital-to-analogue sound card...