Thanks for that useful info Rschmid. I’ve since tried recording the stop change midi data but also by rightclicking on a stop there’s an option to assign the action to something. There’s a learn function though I couldn’t get this to work. I’d be interest to know if you’ve tried Grande Orgue. My search for free organ samples led me to GO and at first glance it seems extremely like Haupwerk and is free. YOu have to load a sample set as there isn’t one provided as there is with HW but there are a lot of free sets online. What’s more I got the ‘learn’ option to work and be able to assign simple midi actions to stop actions. Still all very new to me!