So i've had my 500 for about a year and had this issue when I first got it but it worked itself (maybe I figured out the work around and forgot/not sure) out back then, but since I've been reworking my patches I've had it happen again:
When I change the volume on the mixer in edit, it sends the change to the unit. I will then send the selected patch to the unit to save it, but when I use the unit to change patches, it ignores the mixer change and goes back to a lower setting.
The work around I've found is to use the unit to edit the mixer setting and then it works/saves permanently to the unit. But I cannot understand why it keeps happening.
I must be doing something wrong and I would like to figure out what so I can not keep doing it.
Any help is appreciated. :)