Elwood Francis, guitar tech for ZZ Top’s Billy Gibbons, gives Premier Guitar a rig rundown. The rig includes two RJM Music RG-16 audio/function (loop) switchers. You’ll see the RG-16s about 8min 30 seconds into the video.

Way back in 2007 we released our first MIDI-controlled audio loop switcher, the RG-16. The idea was to improve upon the existing switchers on the market (Voodoo Lab GCX, Rocktron Patchmate, Axess Electronics GRX4, etc.) by implementing not only 8 audio loops but also 8 function switches for amplifier channel control. Previously, other audio loop [...]