I'm probably an idiot, but I can't make this work with the gateway app. I've paired and connected with bluetooth, I got my app open, pressed sync, but whenever I change something on the phone, nothing happens on the amp. Some videos show I have to go to preset, through the bottom left corner thing, to get into presets and turn the screen gold, but whenever I go there it says "Tap to sync" and when I do, nothing happens. please help.