Okay, it's running BandHelper. It shows me the tempo of the song, quick reminders (key and chords), notes, lyrics and stuff.
When I select a preset or Song on my RJM (MIDI foot controller), BandHelper automatic. switches to that song.
Also vice versa: when I select a song on my iPad, the Axe-Fx (and RJM) will switch too. This is especially important when using the AX8 (my B-rig), because the AX8 doesn't have a Song mode.
I've tried running my iPad wireless, but it wasn't reliable enough. It works just fine running a long USB cable. Downside is that it requires more cables. I can run the RJM on a single cable (incl. power), but not when also using the iPad.