@derek Check out the Airstep bluetooth pedal by Xsonic. They just came out with a Spark version that lets you switch the 4 presets, and turn on and off effects in that preset. $99 presale going on now!
@danny-green It would be really cool if they could add an 'insert jack' instead of just a line out ... it could be used for either, and possibly as a movable point so you could add an external effect at various points in the effects chain. or use it as a line output at that position in the chain.