Steinberg VST Live has only been recently released, however looks very promising when compared to Mainstage. It seems to be less Memory hungry, and less likely to crash than Mainstage. One feature it is missing is a Chord Trigger and Arpeggiator. I have tried installing Ripchord, however it only shows up as an Instrument, and not an Effect. I have raised this issue on the Steinberg Forum. If any developers have any ideas, or have access to an updated code/file, I would be happy to try it. I have contacted Ripchord via the site via email.
Thank You.