Hi, The last part of my tests: using different audio files. Well, as I thought: this shows the bottleneck of IDE vs. SCSI: not using any DSP plugins already causes lots of CPU load when using the ATA66 drive. I got 24 MONO tracks, all using different 16bit 44.1 kHz files. The entire system (OS, apps and audio files) are on the same ATA66 harddisk. When adding a 25th audio file, I got an overload message. Very strange: the metering is not correct: the audio load showed 40% and the disk I/O showed 25% and still an overload when adding just one more file. I guess that's a bug in the disk I/O metering. So, 24 tracks is the maximum (adding a Fat EQ to every track got the CPU load to 50%, so there's still room for some DSP stuff) using only this one harddisk. Another thing I've noticed is that the disk I/O metering sometimes doesn't work after an overload. Ciao, Joeri -- Joeri Vankeirsbilck joeri@... List-admin Logic-users/SoundD*ver-users/Logic-TDM FAQ & Info: http://www.nbdj.com/Logic/mailinglists.htm http://www.nbdj.com - Natural Born Deejays http://www.nbdj.com/Logic - Logic Wish List