Multiple-frequency separations

Hi Ben, a topic I am struggling with is multiple-frequency separations. I have come across this concept on the web, but not been able to get it to work.

It is like a normal frequency separation with a blur and subtract layer setup, but instead of one blur radius to separate low and high frequencies the multiple-frequency version has several high-frequency layers with different blur radius amounts to reveal finer and finer details on top of a single “low-frequency layer”.

I am interested to try this to see and edit different levels of texture.