But there are times when USB microphones and OS X 10.5 don’t cooperate. When using a USB microphone, you may occasionally encounter bursts of static. To avoid this issue, try the following solution.
Launch Audio MIDI Setup (/Applications/Utilities). From the Audio menu, choose Open Aggregate Device Editor. In the sheet that appears, click on the plus-sign (+) button to add an aggregate device. In the Structure area below, enable the Use option next to the driver used by the USB microphone (USB Audio CODEC, for example). Enable the Clock option next to that device and click on Done. When you want to use that microphone, choose Aggregate Device as the input source—either within an application or from the Sound preference pane’s Input tab.
Hopefully this solves our dilemma.