Hello, first i'm sorry for my english, i'm french I have had a ME-50B multi-effect boss for about 15 years. I have a problem with the Delay / modulation part. When I select a certain effect, the sound obtained does not correspond to the selected effect. For example when I select "cho + reverb" I have a phaser sound, when I select the phaser I have a delay sound. From time to time all of these put back in place. I had not used it for 1 year because of this problem, and it had disappeared (nice) but the problem reappeared after doing the factory reset. How to repair this problem. Thank you.