This proposition paper wants to raise the issue of design ideology within the field of music software that recreates vintage analogue synthesizers using subtractive synthesis. There is a clear dominance of a skeuomorphic design ideology regarding the Graphical User Interface (GUI) within this field. The suggested study aims to research if this is a correct choice in terms us usability, accessibility and intuitiveness. The suggestion is to conduct a series of A/B tests of custom prototype UIs on three predefined groups of users. Group A, with a previous knowledge of analogue hardware synthesizers, Group B, with a knowledge of music software but limited experience with analogue hardware synthesizers and finally Group C, with a limited knowledge and experience of both music software and analogue hardware synthesizers. The prototype GUIs will be made using a skeuomorphic design paradigm as well as a flat design paradigm that also incorporates a couple of new ideas in terms of input controls. The A/B tests will be complemented with semi-structured interviews with the participants.