I've been using PT6.01 and OSX10.26 for quite awile now with no major problems, I have to admit that I'm taking it to the limit, 40 to 60 tracks with a lot of plugins and also a lot of SoftSynths (RTAS) like Plugsound, Atmosphere, Stylus, Trilogy and SampleTank. I'm talking about using them all in one session (sometimes more then one each). I'm using it with a G4 dual 1.42 (1.5 gig ram), a 23' Sony LCD, Baby Hui, 2 removable SCSI and 2 removable Firewire, DDS3/ Mezzo, Midi I/O, HD3 and 192 with an extra A/D card. Got to tell..... It rocks!!!!! Marcello Azevedo