You can find them everywhere. Hiding among church congregations, lurking in village halls, appearing suddenly at rehearsals, and ever-present in offices around the world. No one gave them this role, and it might not be a job that they want to be doing. Nonetheless, they’ve been here forever and won’t be going away any time soon. I speak not of cleaners, mice or even lawyers. No, I refer to the amateur AV engineer (aka audiovisual engineer).