-I Identify the program version.
-f freq Use a sampling interval based on 1/freq seconds for sampling the time of each fx value. Default 100.
-e Load from a text file in ESPS format, with only the first number on each line being loaded. To generate this format in ESPS, use "get_f0 file.wav file.f0", then "pplain file.f0 >file.lst".
-h history Place a "history=" indicator in the created item header, with the argument history.
-O timeoffset Set "offset" field in output item to given value.
FX Loaded fx item