I am using the "Media Monkey" to play my Live Performance LX piano too. I have a little SFF (small form factor) computer connected to the LX via the built in sound card. I have Media Monkey on the little computer with all my LX MP3 files in the library. I am using another great free program (free for non-commercial use) program to interface with this computer from any computer in my network (or even any computer in the world (isn't that fun,I can actually play my piano from France if I want to)) "Team Viewer" is used to set up a remote desktop control that is much easier to use than Microsoft's "remote desktop" or "remote assistance". I don't even need a monitor on the little computer as it boots to running "Team Viewer" which means that I just have to turn on the computer and walk away/ I can play the piano from anywhere as long as all computers have internet access.
I used to use an "Airport Express" connected to the LX but don't need it anymore. A big advantage is that the media files are on the directly connected computer. All streaming is direct to the piano, only the control is across the network. The result is perfect timing, no glitches whwn the network is overloaded.