The EXTC is a 500 series interface that enables more creatively inclined engineers to introduce
guitar pedals into the signal chain. The EXTC takes a balanced signal, unbalances it and reduces the
level so that it can properly interface with hi-Z guitar pedals. Once the signal is processed, the EXTC
reverses the process by taking the unbalanced signal and reconverts it back to a +4dB balanced line
level signal for easy manipulation in the professional recording environment. This, for instance, lets
you add wah to a kick drum, tube distortion to a vocal track or maybe an old-school tape echo to an
acoustic guitar. As pedals can be noisy, the EXTC is transformer isolated to eliminate hum and buzz
caused by ground loops. A 180° polarity reverse ensures the wet-dry mix is in phase.