According to Arctander: “This aldehyde is widely used in perfumery as a sweetener and fixative, not only in very sweet type floral fragrances and the conventional fruity lipstick-type fragrances, but in general as part of the fixative element in perfume compositions where a creamy sweetness is desirable, particularly in combination with florals such as Ylang-Ylang, or with all members of the Eugenol family in Carnations, etc.
Ethyl vanillin is often used to substitute a larger amount of Vanillin in a fragrance when a discoloration problem arises, due to the active hydroxyl- or aldehyde-groups of the Vanillin/Ethylvanillin molecules. The discoloration hazard can be reduced and the sweetness maintained although there will be a loss in physical fixation effect.”
He describes the smell as :”Intensely sweet odor, warm, slightly floral and and with some resemblance to Vanilla in its creamy sweetness. The tenacity is outstanding, and the odor power only demonstrated in dilutions of this chemical.”