Chris Miller, guitar tech for Keith Urban, gives Premier Guitar a rig rundown.

The guitar rig includes RJM Music’s Effect Gizmo’s (function (loop) switchers).
You’ll see the RJM Effect Gizmos about 1 min 50 seconds into the video. They
bought the Effect Gizmo (audio loop switcher) right after the Nashville flood
in June 2010.

Here is another video too. This one is by Guitar Magazine

Chris Miller explains the Effect Gizmo a little after 2 minutes into the video.

Find more reviews of RJM Music products here