The Gladio SC is based on the Gladio 1st channel, with the exact same sound and controls, except the new CLEAN knob. This addition makes a very big dfference, and it’s the one that could actually make the sound be closer to SRV.; the clean signal is taken directly at the input of the pedal and mixed back with the overdriven signal at the output, the CLEAN knob thus manages the volume of the clean signal. with the result of having a “clean layer” on top of the overdrive sound, which help a lot to achieve that texas-blues sound.