Behringer v tone bass bd121 stompbox behringer bdi21 p the behringer v tone bass bdi21 is a feature packed analogue di stomp box built especially for bass p p the bdi21 combines the features of an active di direct injection box with tube emulation circuitry it s like having a truckload of vintage tube amps at your toes p p the blend control allows you to mix the amount of tube emulation you want with your direct bass signal and if you don t want to use the tube emulat