The new edition of the Submarine now has three switch positions. It allows you to isolate sound from one or two strings of your guitar. With the switch in the back position both strings are sent to the first output. With the switch in the middle position, only one string is heard. Push the switch forward and the Submarine is turned off. For those wishing to take things one step further, switch to the middle position, plug in a stereo cable, and hear one string down the left channel and another down the right. One guitar, many sounds.