In an early write up I'd seen on the RD re-ish, the knobs were listed as Volume, Blend, High, Low, Mid, and Mid Sweep, with an active/passive mini-toggle...Great question. The EQ section is a little weird. There's no instruction manual specific to the controls on this model (classic Gibson).
The two big knobs are volume and blend.
Sweetwater says this - 1 x master volume (I know that!), 1 x blend (Yup, sorted), 2 x high/low EQ (not really?), 1 x mid parametric EQ (that's the 3rd knob, for sure), 1 x mini-switch (active/passive) (maybe my battery is dead, but it's hard to tell which is which).
