If you graduated from guitarist to studio engineer, and you have no idea what to do with all these stompboxes you spent years collecting, the
Radial Engineering EXTC Stereo is the box for you. This little tank of a unit will be the go between from your studio-level gear to your instrument-level pedalboard. Use your favorite flanger as a mixing effect, or breathe new life into recorded DI (directly inputted) guitars by reamping them.
All the inputs and outputs you need are built into the box. You'll also find level controls on both the send and receive paths to properly gainstage your gear, so you get the optimum volume going into your stompboxes, and coming out from them as well. All of this will let you use your gear in exciting new ways.