scan for MA of volume crossover with price action

This is pretty straightforward, except you need to specify a range for the price change, instead of an exact percent change, since few, if any, stocks would move exactly 4%.

There are two ways to specify percent change - using the PctChange function (available in the Technical Indicators dropdown on the Advanced Scan Workbench) or using a decimal fraction.

Then, by "fast" moving average, I assume you mean an exponential moving average. This uses the ema() function (also available in the Technical Indicators dropdown). The two parameters are the number of values to use, and which value (in this case, volume).

Finally, there is an operator, 'x', to capture one indicator value crossing above another.

So, it should look like this:

//and [PctChange(5,close) < -4] // the "//" make this line a comment, the scan engine won't see it
//and [PctChange(5,close) > -5]

and [close < 5 days ago close *.96] // if you "uncomment" the PctChange lines, add // to, or delete, these lines
and [close > 5 days ago close *.95]

and [ema(14,volume) x ema(28,volume)]