If you just alias the buttons from the receiver than it will follow the ir routing for that device. In other words, on page 2 where you want to add the soft buttons, create your buttons (receiver vol+, receiver vol-...) Click on those buttons one at a time in the simulator window and then click Macro programming. When it starts recording, in the tree view, select your receiver on the left side of the window and click Volume +, and then click the Macro record button to stop the recording. Do the same for each button you wish to alias over.