Well,i gonna say opposite of all other guys--dont shoot me please!!!I was using mymp3pro3.01 as a player and it worked great.....If i remember good it had slots--4 or 8 of them and you could use for example steinberg plugins--declicker,denoiser or whatever!!!!!!It was doing job just as any other audio editor!!!!So my opinion is that you can use steinberg-wavelab plugins in mymp3pro3.01---do not know for version4---also,i dont have a mymp3pro4--is it good--if somebody can pm me and let me know??
Litlle edit;i dont understand what exactly you want????So if your question is can you use pluginsfrom wavelab??--yes you can----but they are vst!!!!!