A client asked for a way to balance a guitar pedal so he could send and return Line Level to his guitar pedals. He wanted a way to use his pedal collection as effect sends. We came up with a modified Ward-Beck Systems POD-1. The POD-1 offered op-amp gain adjustment trimmer pots so you are adjusting the gain of the balancing amplifiers.
You could also use this as a re-amp tool and a hyper-transparant Direct Inject box for keyboards and anything unbalanced.
XLR input Balanced +4dBu differential Receiver to an RCA connector to a 1/4″ TS jack that feeds the pedal then return to the opposite.
If you are interested in trying one out contact Ward-Beck Systems