I have for sale a used Polytone Taurus IV, not much info out there on this everything seems to point to the George Benson anled 2x12 model. This is a single 15 in with two 5 in speakers on the side and they do work and it has a switch for guitar and keyboard. It has a tremolo effect, reverb, and distortion. Polytone amps are highly regarded jazz amps and this amp is very clean and sounds really good. It comes with a nice cover and the only issue is that two wheels are broken.