Comment by TheRealPomax

It sounds like you don't actually know how a real organ works, which literally has different instrument groups all over the place behind the walls, with your stops controlling which instruments sound out, and your separate decks giving you additional control over which sections to play.

You'll want to give https://www.youtube.com/watch?v=JeB3JnKp8To a watch, where Rob Scallon takes us on a trip to discover how incredible these instruments are, and should highlight just how little an organ is like a piano (not even "four pianos") and how much it really is an entire orchestra.