I've searched NT Forum and Big Mikes forums and cannot find it anywhere. The only clue I have is a chart picture by ZT in which He used it along with other indicators.

My apologies, the indicator was posted by ZTR in his chart at

Volume Ladder for NT - patterns and setups "journal" I've been thinking of starting a new thread to discuss in general and how I'm using Gomi's volume ladder for trade confirmation. I also am very curious how others are using and interpreting the volume ladder. So I invite anyone else to …

I was using it with NT7b16 on MedianRenko charts, but lost it when I had to blow aaway b16 due to chart response getting bogged down. It looked very promising.

Geez, Don't I feel dumb.
If I had looked at a couple of posts later (#75), I would have answered my own question.

Thanks ZTR, great stuff.