Hi guys I’m relatively new to the pedal world as I’ve got by with a Timmy for many years. I’ve just bought an Atomic Brian and although the bass cut and girth controls are simple to understand I’m not sure what the + and - switches actually do underneath them. It probably sounds like a dumb question to some but pedals aren’t normally my thing. I haven’t had much time with it yet but I can see why it’s so popular as it makes my amp come to life. Sounds very nice to my ears.