Thanks. I checked Carla Homepage. It must be VST host program. I use Reaper as VST host ( or called DAW ) and Sforzand as VST plugin. In this case , I can make use any plug-ins supported. Talking about LSP and Zita reverb, Reaper supports LV2, but I could not found binary for windows, unfortunately. I think, under using Sforzand as standalone program, MacMacMac, you are not wrong.