Mars Effects USA
The Mars A-B-Y Compensator is a great little A/B out box that is designed to offer balance and boost as a direct point of entry for running two amp systems. The battery powered Compensator offers a very nice + or - 8db Boost. Put the Compensator in front of your effects and then to amp and you can regulate the db output to give shape to the overall output as you choose. There is a manual switch that is A+B, or control either A or B outs with the footswitch.