By the way that was not meant to snub the fella that described the t-slots as the 'intermediate circuit'. He is right it does flow fuel after the idle and before the mains.

It's just that it's also important to understand that the IFR and IAB combine to tune the T-slot mixture and the idle screws just meter that same mixture to the 'idle circuit'. That's why when you lean out the T-slot with a leaner emulsion you need to feed the motor more of it at idle with the idle screws.

I have only tuned a handful of DPs- it is possible that there are some with seperate intermediate circuits but I haven't read anything about them in my dusty holley books and I never tuned a dominator 2 or 3 circuit...