Hello this is my first time posting on this forum. I have a protone haunted delay. In bypass everything is fine signal goes from guitar to amp. When engaged light goes on but no sound gets through. I took off the back cover and multimetered the dc in and it is getting 9 volts. I don’t have much in the way of trouble shooting chops and any assistance would be appreciated. I was multimetering all the components but don’t really know what I’m looking for.