I'm new to Helix XL Stomp and modeling in general, so just learning how this works. I've been setting up snapshots, and am trying to do this both with presets I create, and some of the presets that came with the unit. I have no trouble doing it for my own presets, but when I try to set them up for the already-existing presets, it doesn't take - I change a parameter in snapshot 1, and that same parameters changes in snapshot 2 no matter what I do. Are the presets that come with the unit barred from having snapshots created within them? And if not - what am I doing wrong? Thanks in advance for any advice on this.