My system is a 1,25 Ghz, 1 Gb RAM Powerbook, Motu 828 MkII and Logic Gold (soon to become Pro). I've been using my Mg Modular on a 1 Ghz, 512 Mb RAM, AMD Athlon PC earlier.
When I play the MM on my new Powerbook, I'm quite surprised by the bad system performance. Four voices at the same time seems to be more than the Powerbook can handle, and the System performance meter goes skyhigh. On my PC, I'm quite sure I used to run two versions of MM with no problem, one playing a chord (3-4) voices, and one playing a bass- or leadline.
So I'm interested in hearing other Powerbook-users experiences with MM in Logic. How many voices can it handle. By the way, the Ana String preset seems to be one of the heaviest.
And also, I use the Oddity, which seems to use very little CPU. Battery also works fine, and audio recording is brilliant with buffer 256.