well, you dont have to pan the sends if the tracks you are sending from are panned the way you want, since you are sending post fader/pan. it should work the way you do it though. anyway, do you have a mono effect on the recieving track that might be collapsing the signal? are you sure that you are sending midi though? i dont think sending midi through a distortion fx will do much good...what track is the vsti on? edit: fabians edit is probably spot on. if you are not using a foldertrack, you have to disable the master send of the two tracks you are sending to the third. try alt+click on the i/o button of the two original tracks and see if that doesnt solve the problem...