Were Mussaf Sacrifices Offered in the Desert?

Were Mussaf sacrifices offered in the desert? The well-known opinion of the Ramban states that the mussaf (additional) sacrifices, which are listed in our parasha, were not offered in the desert; they were instituted only at the time when Bnei Yisrael entered the land.  In this shiur we shall examine this view and propose an approach according to which the mussaf sacrifices were indeed offered, but in a manner that was different from the custom fixed for future generations - with a focus on the integration of God in our lives.