At the end of December 1782, Mozart decided to present music from the new Haffner serenade at a concert. After asking his father to send the score of the serenade back again, Mozart was amazed at its quality, given the fact that it was composed in so short a time. He set to work to make a number of alterations to the score in order to convert the new Haffner serenade into the Haffner symphony. These alterations included dropping the introductory march (K. 385a) and one of the minuets. In addition, the repeat signs were removed from the end of the first movement's exposition. Mozart also gave the "Haffner Symphony" a fuller sound by adding two flutes and two clarinets to the woodwind section of the first and last movements. These added woodwind parts are not new melodic material, but simply a doubling of octaves within the woodwinds.