Being at a university of music, we are keenly aware of how musical practice entails close practical and affective relations with involved objects—meaning acoustic instruments and other technological equipment. Over time, these objects become trusted professional partners that require but also resist bodily and intellectual interaction. Working relationships with them can be of reciprocal kinship or of a more negotiatory or even confrontational nature or even take on ritualistic and spiritual forms. In our project, the notion of spirits is used metaphorically to indicate an opaque complexity and stands for a self-willedness of technological systems.  Funded by the austrian science fund, Grant DOI 10.55776/AR821.