This is very elaborate and precise dual tube overdirve. It does what it does very well - emulates the distortion of vintage Hammond/Leslie combination. If you have the time to tweak each particular sound, for example in studio recording situation, it will do the trick. However, if you are frequently changing your drawbars and playing in different registers, the distortion will not follow as the real vintage Hammond/Leslie does. For example, if the distortion sounds right for a solo line with percussion, it will not sound right for chord chops. You would have to tweak it in between and two "channels" will not be of a much help. So for me it is not very well suited for live playing. Anyway, I am giving 4 stars because of the potential for studio use.