I really don't know as I have never played out of an ABM. I can only say that I have read that the Rootmaster has been compared to the MAG series and that the Shape button boosts the lows and highs making it sound like an ABM, IDK. When I first tried using the Shape on a gig for 1 song, I thought it was going to sound muddy due to how low it got, but I actually loved the tone and feel I got out of it. I pretty much now run the Rootmaster with the setting on my picture but with the middle knob now at 12:00, everything else stays the same as the picture and it sounds great. Very similar to my GK 700rb II as strange as that may sound to some.
Anyway, sorry for the long winded post. To answer your original question, I don't know.
Anyway, sorry for the long winded post. To answer your original question, I don't know.
