The sounds in Mini Motorways are all procedurally generated and unique to each gameplay session, so in a way there a distinct difference between the ‘music’ and ‘audio’.
In the audio settings, there are options to adjust Volume and Soundscape. Volume only controls how loud the audio is, with options including Off, Quieter, Quiet, and Full. Soundscape controls what kinds of audio is played while playing the game. The setting options are Full, which is everything, Minimal, which includes only important game feedback sounds, and Off, which is no audio at all.