These three parameters are the standard values for MACD indicators.
You should leave these at their default values unless you specifically
desire your MACD indicator to be calculated using different moving
The MACD indicator is able to alert you when the MACD and Signal line
cross, or when the MACD line crosses the waterline. If you set
this to true, you will receive an audible alert and an alert window when
a closed candle causes a new cross of the moving averages, or causes the
MACD line to cross the waterline. These alerts will happen once
per candle. Note that when you change the period of a chart, the
indicator resets itself to thinking that the current candle has not
fired an alert yet. So, under certain conditions, changing the
chart period back and forth could cause multiple alerts.