> Did the 6.4.2 update (or the latest 10.3.4 OS X update) have any > positive effect on the the problems folks are having recording at >96kHz under OS X? In short.....NO! I recently did a test with Logic Pro and Cubase SX to see what gives with audio data transfer in different audio applications. While Logic is stellar at dual processor CPU usage,(much better than Cubase) it is terrible at audio transfer from disk. Since your track count is heavily dependent on the ability of an application to transfer data from disk, Logic fails to deliver the track counts it should in OS X. I thought the audio transfer rate thing was an OS X core audio problem, but in fact, it's a Logic problem. Cubase SX has much better transfer rates than Logic. Cubase SX was showing practically zero on it's VST Disk Performance meter with 36 tracks of 48khz audio being streamed. Logic was at about 30% on it's meter!! If you think about it, everything else audio and video transfers great on a G5. The only thing that gives you the "Disk Too Slow" warning is Logic. This is a major "pet peeve" of mine about Logic. If transfers were being completed as they should, the G5 would be capable of 128 tracks of audio at 48khz, and at around 64 tracks at 96khz. Right now, you'll be lucky to get 12 to 16 tracks of 96khz sample rate audio to stream from your HD before Logic gives you the "Disk Too Slow/System Overload" message. No amount of disk "Raid" or 10,000rpm SCSI or SATA disks, or FW800 drives are going to help your track count. There's a problem with Logic.