Here is how you can apply an effect (FX) to a MIDI track in Reaper. It works the same way you would apply FX to an audio track. In this example, I have a virtual instrument - a snare drum sample - on a MIDI track in Reaper. First you hear what it sounds like with no effect applied. Then I add a Reaper effect - ReaVerb - and play THAT new sound. The track with the reverb effect applied is VERY "reverby." It is very obvious that the effect is being applied to the MIDI track.
![](https://i.ytimg.com/vi/2FaUc5Cc1dY/maxresdefault.jpg)