I was working on a fairly large project recently (well, for me it was kinda "large," lots of VI's and audio tracks w tons of effects, AU plug-in processors & automation mapped on many of the tracks. It was a bit taxing even on my Dual Core Quad... But, everything did play. I noticed in this project, that every time I double-clicked the Ultrabeat track (in order to) open up the midi hyper-editor window, one or a few of my cores would just start climbing. I would begin editing my Ultrbeat midi notes; moving, deleting etc and that would just send the CPU core to max out! :eeek: As to be expected, this would lead to that familiar crackling break-up of my audio upon playback, the kind of crackle you associate with an overloaded CPU core. The thing that seemed to "cure it," was quitting Logic and re-starting it again. I could duplicate the problem again sometimes by double-clicking to open the Ultrabeat Hyper Editor and literally moving ONE note, a crash cymbal sound lets say, to a different bar. Immediately, one core would spike and I could barely play down my project. I didn't worry too much about this in that particular project but now I see it happening in "new" projects (or, I should say, songs I begin from my own created templates.) Has anyone had issues editing notes in Ultrabeat and having it affect system performance in Logic? I am happy to provide any info lacking here. Thanks!