An MACD (Moving Average Convergence/Divergence) study is the interaction between a short term (12 days) and a long term (26 days) moving average. You can set the following variables for an MACD Signal study:
Slow Smoothing
The rate of change or smoothing of the fast line (valid range is between 0 and 1).
Fast Smoothing
Smoothing of the difference between the long-term and short-term moving average (valid range is between 0 and 1).
Signal Smoothing
Smoothing of the exponential moving average, which is the difference between the short (fast) and long (slow) moving average (valid range is between 0 and 1).
Series
Specifies whether the data points represent the open, close, high, or low.