EXHIBIT 4.1


                        Advisors Asset Management, Inc.
                              18925 Base Camp Road
                           Monument, Colorado  80132


                                  July 16, 2008



Advisors Disciplined Trust 256
c/o The Bank of New York Mellon, as Trustee
BNY Atlantic Terminal
2 Hanson Place, 12th Floor
Brooklyn, New York 11217


     Re:                 Advisors Disciplined Trust 256
                 Value Line Select ETF Index Portfolio, Series 1
                 -----------------------------------------------

Ladies and Gentlemen:

     We have examined the Registration Statement File No. 333-151423 for the
above captioned fund.  We hereby consent to the use in the Registration
Statement of the references to Advisors Asset Management, Inc. as evaluator.

     You are hereby authorized to file a copy of this letter with the Securities
and Exchange Commission.

                                Sincerely,

                                ADVISORS ASSET MANAGEMENT, INC.


                                By     /s/ ALEX R. MEITZNER
                                  ------------------------------
                                      Senior Vice President