First make sure that you’re using Ableton Live version 10 or newer. Past versions don’t support multi-channel audio.
Next, you may need to turn on “Use Audio Units” in the “Plug-ins” section of the Ableton Live preferences. It usually is not turned on by default… and though we have a VST3 version of QUARK, Ableton Live doesn’t play nice with it for some reason. Please use the AU version.
