Hi there. I occasionally get a system overload message when running Logic 8 on my 2.8 GHz quad-core (4 GB RAM; 10.5.8). On tonight's project, I have 9 SI (7 Logic instruments; 2 Omnisphere, but not hefty ones) tracks, each with one or two plug-ins, but nothing that should be bogging me down. And the point where it stops has only 3 tracks with active regions. When it does stop, I see that one of the 4 cores is tapped out, while the others show no activity. Doesn't Logic share the load between them, or do I need to tell it to do so?

As an aside, what's an FFT-based effect? I saw this in the manual...

Hi Sammy, Apple have a newish document on their site explaining memory management in Logic 9, which may help explain your issue: [url]http://support.apple.com/kb/HT3919[/url] FFT I believe stands for Fast Fourier Transform algorithm: [url]http://en.wikipedia.org/wiki/Fast_Fourier_transform[/url] :) Rounik

Thanks for the links. I don't see an answer to my specific question in that first document, at least not about the individual cores and the way they work together (or not). I'll keep digging...

I should add that Logic should automatically distribute across the cores. But during this transition from Logic 8 to 9, Leopard to Snow Leopard and the inevitable 32bit to 64bit, I'm hopeful that Logic will become more efficient in this area and really take advantage of multi-cores. I love Omnisphere... but it can be fairly heavy at times. Best Rounik

I've checked on some other CPU heavy projects, and I think the issue might be something specific to this particular one. I noticed it takes quite a bit longer to open than most as well. And my theory that only one core might be functioning was quickly shot down... I'll do a Save As and hopefully salvage this piece. Thanks again.