Maybe some other minor difference, but mainly the TIM has a boost switch, as well as an effects loop. I think the Timmy may have 1 more clipping option, not sure though. Never actually held a Tim, so this is just second hand info. I have had a timmy though. Very nice pedal, although I sold it thinking some day soon I will get a Tim. Would like to have that loop option.so what is the difference in the Tim and Timmy... I am sorting through tons of results of a search but would love a quick answer.