I'm sure this question has been asked a bunch of times, but I've searched and can't resolve the issue. I have the guitar rig 5 VST recognized in reaper and I can record through it, but I can't hear myself playing while I'm recording and nothing is showing up in guitar rig. If I open Guitar rig individually (as in, not in Reaper) I'm somehow getting terrible sound through only my right earbud....
On the reaper track, do you have input monitoring enabled? It's that little symbol that looks like a speaker, if you click it, it should cycle through 3 different options.
TacoBellGrande  I figured it out actually. For some reason it wasn't picking up the input in asio4all, only the output. So I disable all windows sounds in the control panel and then it recognized it. Thanks!