No problem on Mac G4 and G5 Mac OS X 10.3.9
updates for Mac and Windows XP on the site of USB ...

SUITABILITY/PERFORMANCE

Mac mini 1.42 GHz
1GB of ram
this app does not require too much CPU power, you just need the ram ... and the app is very stable.

OVERALL OPINION

I've had the more one year now.
the ambiences are very well samplées and the effects are good qualities.
the bank is well organized making it easy for family research.
There are even pads in original ambiences that can make such an intro ...
So for the price I recommend it to add sounds strange, bizarre embellish your music.