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The Twin-City is a professional ABY switcher that allows silent switching between two amps without buzz or hum from ground loops. The following page describes how to power the Twin-City and connect it with your amplifiers. For full details, please click on the icon to the left to download the user guide for this product, or visit our FAQ page for answers to frequently asked questions.


The Twin-City is an active switcher that enables you to connect two amps and switch between them, or drive them both simultaneously without degrading your natural guitar tone in any way. In our view, changing the tone of a ’57 Strat is not an option! The Twin-City buffer lowers the output impedance and susceptibility to interference allowing you to drive long cables without tone loss or noise. Drag Control™ is a recessed "set-and-forget" control that lets you compensate for cable signal loss and introduce the perfect load to replicate the way your guitar's pickups naturally interact with your amp. Advanced Electronic Impulse Switching (EIS) is 100% noiseless and free from popping noises produced by mechanical switches.

To eliminate ground loops that cause hum and buzz, the Twin-City is equipped with an isolation transformer on OUT-B. This output is further augmented with a ground lift switch and 180° polarity reverse switch that ensures both amplifiers play in phase while noise is reduced to an absolute minimum, even when using older amps that are prone to noise.

Bright, easy to see LEDs deliver on-stage switching cues so you know exactly what your amp status is at all times. The Twin-City is a powerful ABY switcher that delivers all of the natural tone, punch and clarity without the inducing noise of any kind.

The Twin-City

Requires an external power adapter that outputs 9 to 12 volts DC with a 2.1mm barrel jack wired center pin negative. The Twin-City will draw a max of 100mA. Possible damage may occur if another type of power adapter is used. Consult your dealer for more information.

Connections and Setup

Before you begin, turn your guitar amplifiers OFF. Connect the power supply adaptor. An LED illuminates indicating the pedal is powered up and ready for use.

  1. Connect your guitar to the IN jack.
  2. Connect OUT-A to your "A" amplifier.
  3. Connect OUT-B to your "B" amplifier.

Always test your connections with your amps set at a low volume level. Turn your amps on. If no sound is heard check the guitar and power connections.

Activate amp-A by depressing the TOGGLE footswitch (LED A on). Adjust your amp to a comfortable volume for playing. Depress the TOGGLE footswitch again and set up amp-B.

Next, perform a polarity test to ensure the loudspeakers in both amps are moving in the same direction. With both amps active and set to equal volume, flip the 180° switch to adjust the polarity of OUT-B. Listen to the sound at both positions and choose the one that sounds the fullest.

Finally, if you notice hum or buzz, try lifting the ground by sliding the LIFT switch. Use the position that produces the least noise and you’re ready to rock.