Which mods for the ross comp are used on RK's 4 knob comp?

[ppatchmods]

i've read some threads on the forum but i can't figure out the exactly what the trim knob is. i think it might be a voltage sag...? anyone know for sure? i saw the post from Mr RK in one thread saying he used different tranny's so i will be doing the same for my build. any thoughts on useful mods would be appreciated. thanks