This is my large rig. SLM is running on an iPod Touch that is mounted low on the mic stand, but of course, that iPod is in my hand taking these photos so you'll have to imagine that piece of it.

The board to the left of the mic stand (Fractal MFC) is what I normally use to control my songs and presets, but now SLM commands that to the next song bank. The smaller MIDI controller to the right of the mic stand sends commands to SLM (or thru to the rest of the rig) and I use that to INC/DEC songs, INC/DEC presets and flash the tempo (I also use it to do some tap tempos in various other devices). And then there is the large board that sits behind the amps. It's 2 chains of fx driving 2 amps, along with the ability to A/B/Y the amps, send channel switch commands to the amp heads, bring fx in and out of the loops (bypass) and select fx patches in the larger pedals all via MIDI, all via the MFC, and by extension, all via SLM!
It all boils down in a performance to stepping on one button that switches to the next song in the set in SLM and it touches off a chain of events that gets the entire rig ready to go in an instant.