After searching through the archives, I could not find an answer to this question. Does anyone know what is a "flat" setting on the Bass 400/400+? The operating instructions are a bit vague on this. After playing with mine, I am wondering if it is based on the Dual Showman design, where "flat" is something like 2 on Bass, 10 on Mid, and 2 on Treble. Thanks, Tom.