What are organ pistons for?  Anne Marsden Thomas explains their operation, how to set them up, and how a memory system and stepper is employed on a modern organ. This video is one of 26 in a series entitled An A-Z of the Organ, filmed by the RCO team and colleagues around the UK at the height of the Covid-19 lockdown. Starting with A for Anthology and concluding with Z for ? (wait and see!), the series aims to explore various perspectives on the organ - its tonal characteristics, some of the repertoires associated with it, a range of organ-related…