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Lehle Dual SGoS Programmable Switcher

What does SGoS stand for?
SGoS stands for Second Generation of Switching. The new series of Lehle switchers features a
TRS socket for connection with other Lehle SGoS switchers and external MIDI equipment for synchronization. SGoS switchers can receive MIDI program change commands and are very easy to program, they can also send MIDI program change commands and function as a MIDI controller.

Which function do the volume controls for A and B have?
With these controls you can balance the volumes of the 2 amps to create a mix-sound as soon as A and B are active at the same time. Without these controls the Y-sound would probably be too loud, so this is a very helpful feature.

What is galvanic isolation?
Background noise, generated by ground loops, occurs again and again when two electronic devices are connected to each other, and the Lehle Dual SGoS provides a simple but extremely effective remedy when installed between the two units. The two devices are electrically isolated when the `A´ output is used, eliminating this background noise.
The protective earth conductor and the ground connection of the audio signal create a loop which will pick up external interference generated, for example, by coils. Such interference will impair the signal. The Lehle LTHZ transformer included in the Lehle Dual SGoS electrically isolates the ground connection. The hum loop is thus broken at this point.

Can the Little Dual/Dual SGoS be used as DI box since it has 14" sockets?
Yes, you get a balanced or unbalanced (mono-) signal from transformer-isolated output A when using a stereo (TRS) cable.