Audio Cable
The Audio Cable allows you to connect devices which send audio signals to devices which receive and process those. An example would be connecting a tape drive with one or multiple speakers.
Like most devices, audio cables may be colored using dyes or one of various coloring devices like Paint Brushes you may find in your world. When colored, a cable will not connect to any adjacent cable or audio device that has a different color. Uncolored devices will always be connected to, and uncolored cables will connect to anything.