With the MX49 and MX61, we aimed to create synthesizers of suitable compactness and lightweight enough to carry easily to performances in rehearsal studios and live venues. In order to convey an impression of smallness and of being easy to use, we constructed multiple mockups based on the plans received from engineering. I found several of these mockups to be an ideal size, and presented them for proposals as examples of the dimensions a synthesizer should possess in order to be termed truly compact. The compact size of the mockups that we presented was more than just an ideal—it was a technically-endorsed possibility. During design, we sent out for many plans and cross-sectional views of other models for reference, and even assessed how realistic our proposals were in terms of their internal structure and the layout of the switches on the panel. As a result of these efforts, we were able to use this mockup in development and engineering staff, which allowed us to achieve our initial concept of a synthesizer more lightweight and compact than ever before. With regard to usability, we did away with the concept of “modes,” and made bold changes to some of the normal specifications in order to produce an instrument easy enough for anyone to use. The operations panel features four knobs that allow the performer to alter voice parameters in real time to alter the sound, one of the true joys of using a synthesizer. These knobs are something that we created specifically for the MX series. We designed the upper surface of the instrument body in a matte finish with deep knurling, from which the index areas emerge with a glossy prominence. The knobs are pleasantly tactile and turn easily, and feature a design that makes the indices readily visible.