Just program change and apparently you can put it into tuner mode too, though I haven't found out how to yet.
If you've got a Windows PC, download and install MIDI-OX, connect the MS60B, start up MIDI-OX, go to Options | MIDI devices and select the MS60B in MIDI Outputs and click OK, then move your mouse along the toolbar until you find "Send MIDI controller messages", click on that, and you'll see a window that you can either select an absolute patch number from (upper right hand section, patch number = ((section - 1) * 8) + number) or scroll through patches (in the bottom part of the window, select "Patch change" from the drop-down on the left and then scroll up and down with "Value" on the right).
I'm going to see if I can do some sniffing to find what other signals the Edit & Share software sends to a B3 and see if the MS60B reacts to any of those.