I have got memory issues using Mac OS 10.6.7, Logic 9.1.5 (64-bit) with Melodyne 2.1.0 as a plug-in. I have 12 GB RAM installed that my computer recognizes and the hardware control accepts. But it seems it's only using 4 GB. That is indeed a general Mac question to which the guys in the Mac-shops unfortunately haven't got a clue. It becomes a problem when using Logic so then they conveniently tells me it's probably a Logic issue and I should ask Logic people. What happens is: I run Logic with a couple of Melodyne plug-ins. The Mac activity monitor tells me the computer is using say 3 GB of RAM totally (never more than 4 GB). After a while Logic alerts me "out of memory" unable to save data and so on and I have to force quit. The activity monitor usually says Logic is using 400-500 MB and never more than that. So I wonder doesn't plug-ins memory consumption show up as part of the Logic software? Cause there's no specific plug-in usage (Melodyne in this case) in the activity monitor. In such case it would suggest that plug-ins memory consumption is unaccounted for in the computer which would be really bad. Could that really be the case? Should anyone have a clue to why my iMac doesn't seem to utilize my 12 Gig it would of course be fab. I have tried to start the OS holding down 6 and 4 but to no avail.