Hi,
I suggest
http://www.bluecataudio.com/Products/Product_PatchWork/
Works finde here ... straight, simple and stable. Only limitation: only VST2 plugins (effects and instruments) .. no VST3. But ... that's ok for me. Most instruments use VST2 .. and Steinberg instruments I own (Halion 5, Groove Agent and so on) I can plug into Pro Tools using the AU plugin version on my Mac
Greetings
Alex