Griffin Support
What Macs can I use the iMic with? (Mac)
The iMic is compatible with any Mac that has built-in USB ports and is running Mac OS 10.3.9 or later. As for earlier versions of OS X, the iMic will probably work, but you may need an earlier version of Final Vinyl or other recording software (Contact us if you need a version of Final Vinyl not available on the iMic Support page.)
Note: USB Audio should be supported from OS 9.0.4 on. We've had reports of successes and failures in 9.0.4, and you may or may not be able to accomplish what you want in that version.