Oh, I agree, the expression learning was not wasted.
My technical sophistication is decent, but quite unlike my son's who has a computer science degree and works in IT. I did learn MS DOS in the early days and went forward learning from there. So, expressions make sense, as do macro's in other applications. However, my problem was simply what to do with them within JRiver. That is, how and where can they help me?
I realize that many herein are providing help gratis, because they simply want to be helpful and I'm thankful for that. But that doesn't let the paid staff of JRiver off the hook. I see that the expression language is documented -- many link to it. But where is a primer on what comes before that page -- e.g. the why, how and where to use expressions and more importantly, examples of what they actually can do to aid one in automating tagging etc. (as I was trying to do)? There might be a one, but I haven't found it. Without your intervention, I'm not sure where I would have found where and how to enter the expression as simple as it was. And that's too bad, because I would assume many users are missing out on knowing how to, where to, begin tapping MC's vast capabilities that lie just under the surface.