At present only the super resolution pitch detetmination algorithm is implemented. 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. Perform low pass filtering on input. Sets the minimum allowed F0 in output track. Default is 40.000. Changing this to suit the speaker usually increases performance.