AudioVision cannot play from, or record to, a volume formatted with Mac OS 8.1's extended format (HFS+).The startup disk can be formatted in this way without causing any problems (this has only been lightly tested).This particular error message applies to recording to or playing from an OS 8.1 formatted drive on the audio bus. A different error message would appear for recording to or playing from an 8.1 HFS+ formatted drive on the Video bus:File LineCache.c Line:869