This is the volume version of "DecisionPoint Breadth Swenlin Trading Oscillator"
DecisionPoint Swenlin Trading Oscillator can be used to identify short-term tops and bottoms. You can read about the interpretation of the signals (& gotchas) in the link below.
I have added support for NYSE / NASD / AMEX and also a combined mode. You can specify custom advancing/declining volume symbols too.