yes this work just for 1 VST, not the other 4 channels, even that i have setup different midi ports with each VST instrument it will not help.
according to support you need to use some VFX color mapper inside patcher....highly annoying to be honest and they should state it does not support flstudio straight out of the box.
but i still could not find out how to setup with 5 different vst instruments
there is reviewer video at pluginboutique and he also had to use some mapper inside ableton.