VOX VT50 VALVETRONIX AMPLIFIER (Certified Refurbished) VOX Valve Reactor circuit that uses a 12AX7 to produce real tube power amp sound. Twenty-two realistic amp models are built-in, ranging from the latest high-gain types to unobtainable legendary boutique amps and vintage amps. Twelve high-quality effects including independent reverb, rivaling the quality of dedicated units Three banks (basic, effected, and song) are provided for each amp model, giving you a total of sixty-six preset programs. Twenty-two programs of "song presets" simulate the sounds of famous guitarists.