However, when you consider that you can load up to four oscillators and four FM oscillators, four of each style of envelope generator and four LFOs, there's plenty of sonic power on offer. Although the included modules can be installed and patched as you like, there is a limit to how many of each you can use. Technically speaking, Zebra 2 is semi-modular. That's all there is to the copy protection, but don't even think about using an unauthorised copy: u-he have devised something rather special for the bootleggers - if you install a dodgy copy of Zebra 2, the software's interface will eventually start to melt away in front of you! When you open Zebra 2 for the first time, you have to enter your name and a series of numbers. These might be free bonuses, but they're still of the quality we've come to expect from u-he. It should be noted that the main Zebra synth is but one of three plug-ins that comprise the package, the other two being the nifty Zebralette and the ZRev reverb plug-in (see the Bringing up baby boxout for more).