The Overtube is among the very best Tube Scremer clone here around. YOu get the creamy and beefy sound of hte original TS 808, but thanx to the cascade switch, you have more gain ready to roar. Jacques included a cliver circuitry that is completely equivalent to two OVERTUBE linked in serial, exactly as on the SRV set up. Just turn the CASC. switch on and get that compressed high-gain overdrive that will transform you solo in melting iron magic.