Hello, Dave. I use plumbing too, but not for computers, for cables, such as on the stereo.

It finally started to make sense when I visualized music spurting, like water, out of the 'line out' cables and into the speakers.

I mean, what does 'line out' tell you, anyhow? "This here is a line, and it's going out." So what?

Years ago I read an article about picture thinkers and word thinkers. (I'm sure nobody is actually 100% one or the other.) The article said that the two groups do not appreciate one another, and meetings can get acrimonious unless somebody figures out what is the matter.

Most people get along better once the problem is explained.