Probably by accident I noticed today, that when I press RIG UP or RIG DOWN (scrolling available rigs by letter) strange characters appear on LCD.
I recorded short movie. I switch from All rigs, to Favourites (just one rig) and when I keep pressing RIG UP or RIG DOWN some trash appears on screen.
Here is the link to youtube video.
I don't know if it affects anything like sound quality etc, but it doesn't come from nowhere.
I repeated this test for All Rigs (number of 255) and after reaching first or last letter of rigs by pressing RIG UP, RIG DOWN - all is fine