I just released a new version of Musical Pro with a rewritten MIDI over WIFI system.  If you already are using the Desktop Client, you must download the latest version here: http://www.souvey.com/musical. Conversely, the new Desktop Client will not work unless you have the latest version of Musical.  Apologies for the inconvenience, but I had to make some back-end changes to allow for some exciting new features that are on their way.