Nu-X Original TSAC Technology Rotary Speaker Effects Slow/Fast Switch with Adjustable Rising Time Built-in Overdrive Accurate Polyphonic Octave Effects: +1 Octave and a -1 Octave FET Buffered Bypass. Roctory is a word mixed with "Rotary" and "Octave". It is world's first rotary speaker cabinet simulator with a polyphonic octave effect. With NUX original TSAC Technology, it faithfully recreates the lush swirling sound of the rotating lower speaker and the treble rotor horn in 3 Dimensions! It even captures the characters of the over-driven tube amp to the speaker!