Pick zero crossings. Now simple zero-crossing is used to find the pitchmarks themselves. This can be used to eliminate pitchmarks which occur too closely together, or to provide estimated evenly spaced pitchmarks during unvoiced regions. If set to raw, this indicates that the input file does not have a header. While this can be used to specify file types other than raw, this is rarely used for other purposes as the file type of all the existing supported types can be determined automatically from the file's header.
Waveforms can have multiple channels.
This option extracts a single channel for progcessing and discards the rest. Often the lx signal is upside down. This option inverts the signal prior to processing. Often it is desirable to place limits on the values of the pitchmarks. Use the end of a waveform to specify when the last pitchmark position should be.