I need some clarification on the Emerald Pro high gain model vs the low gain model. . Is there a day and night difference between the two amps tonally? . Can you argue that the high gain is more versitile in that you can get higher gain plus you can get lower gain by turning down the gain control? Also, I emailed Joe at Two Rock and he responded by saying, in so many words, that the two versions are very similar. So please try to clarify this for me. Will be greatly appreciated!