FLStudio itself (both the built-in plugins and the VST versions). Also note that I can use other (non-"Juice Pack") VST's from Image-Line in Bitwig just fine (e.g. Harmor's VST version).
In Bitwig ...
FL VSTs often never remember after reload).
3. Put some notes in each layer (test stuff).
4. Save.
5. Close BitWig & re-open file.
6. Press play, note that both Sytrus VSTs are now 50% or less volume than ...