To illustrate sound is possibly not the easiest since it gets very abstract in a visual form. Nevertheless i have tried to make logic speak within each element of my design. There are probably lots of other ways to interpret and illustrate these but i am hoping the end user sees the intuitivity of the product when getting audio feedback from moving the rotaries and faders. To Completely remove a text doesn’t have to be bad. A picture with its strong iconicity stays strong in a wide range of user in etnographic perspective. As long as a Boat is a Båt isa boot a bote and a bateau..then maybe its a stronger case with a pictographic representation. A Combinator can be anything combined but the faceplate still needs to be designed.