SuperG
...you can place the reverb on just the violin track...
i.e. The
audio track hosting the Kontakt output channel that has the violin on it.
In order to be able to process instrument sounds separately, you need to add an audio track and set the input for each output of the synth you're using. If more than one instrument will use an effect, you can put it on a bus, and add Sends to the tracks that need it. But if only the one instrument will use it, just put it directly in the audio track.
Also, when using sends to a bus, set the reverb to 100% wet, and use the Send level on each track to control the amount of reverb added. When putting it directly in the track, use the wet/dry mix control in the reverb.