Ive been searching this forum and the documents from line 6, but can't find any information on this topic.  What I want to do is assign one of the controller pedals to toggle between different values on an amp or fx model.  For example press FS3 to change the amp gain from its preset value to a higher value.  I know you can turn things on and off, but I havn't found a way to just change the value. (aside from the EXP pedal, which I don't want to use for this purpose) I know I could set up different patches with these settings, but I would rather not have to load a whole new patch with it's associated load dropout just to "increase the gain" or whatever.  This seems like a pretty basic feature, I hope that there is a way to do it with the HD500

Thanks!