I have two H9s. I bought them both as Core and added some algorithms. Now I want to sell on of the H9. I'm getting an error when I try to deregistr one of the stompbox with H9 Control on a Mac. My question is can I remove the algorithms I bought on the H9 prior to selling it??
Yes, you can. You didn't describe what error you're seeing, but if one of those Cores was maxed out for example, you'd have to have both devices connected to H9 Control to deregister the maxed out Core.