I wrote (re-wrote, actually) an ask-volume/bid-volume momentum script yesterday, and have been messing around with it in the context of Wave59's new energy bar feature. This volume stuff really is interesting. Check out what happened yesterday:
The chart on top is a regular 2-min OHLC chart, and the chart on the bottom is the energy chart. The momentum indicator is shown on the top chart. It looked pretty squished in the stacked view, so I spread it out to cover the chart - sorry if that's a little confusing. Anyway, a good approach seems to be to use the energy bars to get the general overview of what the market is doing in order to get the bias. I've just been using simple trendline breaks, and market structure to that end. So the trend was until around 7:30 Pacific Time, when we broke the trendlines and started making lower lows and lower highs. That's a downtrend in volume and price, and it's very clear if you just follow simple analysis steps like that. This continued all the way down into 11:00, when things reversed.
Notice how the bid/ask volume momentum indicator played into this. There's the bid-ask momentum line (blue), and then the smoothed (red) line. When the blue crosses the red at a high, that's a sell signal, and when it happens at a low, that's a buy signal. Although it uses volume as well, it's not based on the same ideas as the energy bars, so these are different ways of looking at similar things, and the confluence signals between them were pretty clear yesterday. There's definitely an ebb-and-flow to volume, so thinking in terms of Elliot-style impulses and corrections can be helpful.
Anyway, interesting stuff...!
As a completely unrelated aside, let me just say that uploading an image and posting it inline is SO EASY on this board. lol. Makes me wish we had switched solutions years ago. Feel free to forget the html commands that you've all been forced to memorize in order to get your charts to show.

Regards,
Earik