In an [interview](http://www.acousticguitar.com/How-To/Loop-the-Loop-Create-your-own-Ed-Sheeran-sound) with Trevor Dawkins, (Trevor is Ed Sheeran’s guitar tech and sound man) he said: "We run an A/B system allowing for 100-percent redundancy, with the two sets of outputs from the RME Fireface interfaces controlled by a Radial SW8. "more
"The audio outputs from both laptops go into some Radial SW8 Auto Switchers in the back of the rack. Alongside the audio, you basically send a steady tone from your computer, which goes into a separate input in the switcher. If that tone stops — when the computer crashes, for example — the unit automatically switches over to the other set of inputs. And it's seamless — you wouldn't hear it.”more
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