I mentioned once I think, that my sister plays the guitar. Well, used to. She rarely plays it nowadays (what with her babysitting job she has to do now lol). Anyway, if YOU play guitars, probably at some point need to use active pickups. As someone who doesn’t play any kind of musical instruments at all (my short-lived attempt at learning the piano/keyboard doesn’t count) so I have no idea what this tool actually does so you can just click on the link above.