PROMETHEE is an advanced multi-criteria decision-making method specifically used for outranking the actions or alternatives. The vital part of the method is to assign the most suitable preference functions to the criteria. On the other hand, this part is also the weakest link in the method since there is not much information about it in the literature, although a considerable amount of research has employed Promethee as an outranking method. This paper presents a comforting approach (CAPP) for matching preference functions with available criteria when using the PROMETHEE method. The proposed approach provides consistency and decision support to the researcher during the function selection. For instance, evaluation criteria are determined and weighed to compare Hi-Fi audio systems on the market. CAPP is then put into practice to determine the convenient preference functions matching criteria for assessing Hi-Fi audio systems. Two new preference functions also are developed and presented in the context of this work.