If you are looking for switchers for your guitar rig, check out the Effect Gizmo and Rack Gizmos by RJM Music. Also, the previous version of the Rack Gizmo, the RG-16, has a lot of Dave Weiner video demos (It is pretty similar)
This video shows how to control the RJM Music Effect Gizmo audio loop switcher using a Voodoo Lab Ground Control Pro MIDI Controller. Both preset and instant access modes are shown.
The Effect Gizmo works with just about every MIDI foot controller including the RJM Mastermind, RJM Mastermind GT, Liquid Foot, Fractal's MFC-101