I know there's a few: Who uses the Flat/Shape button on it? Mine's an ABM 300 and I was arseing about with it today because it's still new to me and thought I'd give it a go, and I actually quite like the sound it gives! Only tried it with the P, it's nice and punchy, and little bit middley/trebley but not bad, nicely rounded across all 4 strings. Will give it a go with the Jazz tonight too.
I like the sound I originally had with it (everything set to between 1 and 2 o' clock, the 4 sliders pushed up to the third or fourth dot), but I like the flat EQ button too. I sit cheating to use a pre-set EQ? I feel it is