I actually use volume on 2 counter-trend signals, one looking for divergence from one downclose bar to another downclose bar, not the lows or highs. But I only take these trades when market has gone into zones I expect reversals. But if size of bars are greater than 2 points, I use secondary entry of I call yo-yo, wait for breakout then retracement so I don't have to risk more than 2 points. ES has waves within a swing, so when bars are half or more of size of a wave, very good chance it will retrace. Still think "Delta" advertising fancy word for "net", the only difference I have seen on nearby bid/ask quantity is the first one down to zero, it is next price level, traders don't realize in nano second how much volume they don't see on the Dome, there is one pattern I watch for when coming up to longer term trendline or previous strong pivot highs/lows, watch to see if volume increases or dries up, if dries up am expecting running of the stops and reversal and if more quantity then I expect going through that area. I think vendors want to be able to come as close to "Delta Phenomenon" without infringing on that overly expensive four bar pattern. https://www.deltasociety.com/product/delta-phenomenon
?? WW's 'Delta' is based on astronomy / astrology. From one of his promos: THE SECRET OF DELTA I am now going to reveal to you the DELTA secret. It takes only 16 words. MARKETS REPEAT DIRECTLY OR INVERSELY RELATIVE TO THE TOTAL INTERACTION OF THE SUN, MOON, AND EARTH.
"The time frames and solutions were first developed by Welles Wilder and Jim Sloman in 1984. They include a 4-day cycle, a 4-month cycle, a 1-year cycle, a 4-year cycle and finally, a 19-year cycle." I use to have software for turning points. I found it like anything else, you can make almost anything work with enough money management rules. "Sixteen words" sounds more like it might go up or it might go down. They were really packing them in on seminars as I recall till all found out Wilder and Sloman wanted $25k for it. Big bucks for the 80s and even now. There was another outlandish program called "Wisdom for the Ages", another $25k system.
Delta is another term for net volume I suppose. There is nothing mysterious about it; it is just another tool to look at momentum. I have not looked at the book you mention; I don't see how anyone could fill an entire book on the volume delta.
I found a few videos from them on the ES. I use a cumulative delta chart for observing order flow but have never put much weight into it. Its off in a corner of one of my screens. But what little I did see in the video's looked like it had some merit. But $700 is way too pricey. That is mostly why I created a thread.
Don't bother on the book, became another doorstop of many. Others didn't think it much of a read either.
If one were to really want to read the book they could just type "PDF" after the title. (I didn't want to post the link due to possible TOS violations) Nope; the "delta" Wilder wrote about isn't the same thing.
I use Rancho Dinero for my footprint charts and it also has a "Volume pack". I use something called "Delta force" which is nothing more than the bid/ask difference displayed as a candle at the bottom of my charts. It also displays the current bar statistics including Cumulative delta, Current bar delta, total bids and total asks. The only use I have for delta is the divergences and having displayed right below the chart makes them easy to spot. You can usually see when a move is running out of steam using the delta which is just another clue for you. It also depends on how you trade and what you trade.
I have taken a closer look at using volume delta and in particular comparing bid/ask delta to uptick/downtick delta. I think it is a very useful compliment to watching the DOM and tape orderflow. It offers a longer term view of the market order pressure (bid/ask) and limit order reaction to it (uptick/downtick). I am using Acme analytics rancho dinero which allows both breakdowns. What i find interesting is you can easily spot areas where the limits are holding firm against market order pressure and where they are allowing price movement.