The Honolulu Symphony is poised to announce a major overhaul of its management structure today, in an effort to turn around years of fiscal instability. Former Pittsburgh Symphony executive Gideon Toeplitz will be taking over as interim president, and a new board chair will be appointed as well. The changes were precipitated by a period of uncertainty a the orchestra, which began when a consultant criticized the performance of symphony president Stephen Bloom, who promptly resigned.