Radial Engineering EXTC-SA features a 4dB balanced XLR input that feeds two effects loops with jacks. These are arranged in series to allow the engineer to set up two different pedal chains. These can be used individually or combined together. Two front panel bypass switches allow the user to compare the wet and dry effects. Signal levels are adjusted via front panel send receive control dials to optimize signal-to-noise and minimize distortion. To further reduce hum and buzz caused by ground loops, the effects loop circuit is transformer isolated. A wet-dry blend control lets you mix in the desired amount of effect while retaining the original dry signal. This is supplemented with a 180 degree polarity invert switch to realign the phase of the wet signal should it be reversed. Once processed, the EXTC-SA re-balances the signal and sends it to the XLR output. To retain the signal