Stock TS9 Circuit. Original circuit minus the active switching components. Great parts, basic circuit, great sound. If you want oritinal great TS tone without mods, this is it.
Modified TS circuit. Modified for less bass cut, decreasing "mid hump". Also has more available gain.
Low/medium gain, clean sounding overdrive. Great on it's own or for driving another stage harder.
Boost signal or use as buffer. Very versitile - use to drive another stage harder, to boost your output, change tone by using voice and/or tone trimmer.
Distortion Elements of Rat and Dist+. Great for driving a Marshall for those heavy 80's sounds.