John
Steinberg as a rule will not allow other programs to use any bundled plugins. However, though they have improved the quality of their plugins that are bundled they still don't match the quality of CW's plugins. I wouldn't bother trying to use WL's plugins in X2 Pro. Its not worth the effort.
Kinda to underline that...
I've made
some of Steinberg's plugs work in SONAR. (I don't remember which ones though.) However, in spite of the fact that I actually use WaveLab a
lot more often than I use SONAR...I have only used their multi-band compressor...and even then, not all that often...and only because the (then) current version of SONAR's LP-64 Multi-band was having issues with WaveLab. (I think that's been cleared up.) I've
never had a useful reason to use any of Steinberg's plugs in SONAR...so I don't feel like I'm missing much. I use SONAR's plugs in WaveLab all the time.