Library Prev Chapter 3. If no type is specified type is automatically derived from file's header.
Tracks can have multiple channels.
This option specifies a list of numbers, refering to the channel numbers which are to be used for for processing. This option gives useful information such as file length, file type, channel names. This performs simple numerical differentiation on the contour by subtracting the amplitude of the current frame from the amplitude of the next. The argument to this option is the regression length of of the delta calculation and can be between 2 and 4 -sm float Length of smoothing window in seconds. Various types of smoothing are available for tracks.