Pigtronix Keymaster is a dual, true bypass FX loop pair that can be run in series or parallel. This intuitive, impedance matching device will route any signal into pedals and then back out to any where else. You can also crossfade between effects with an expression pedal! ...

The X-Blender pedal by Xotic Effects offers up a switchable, external parallel effects loop with true bypass. Now you can use all those vintage, non-true bypass pedals without experiencing the signal degradation. ...