Options and their meanings are:
-I Identify program and version number.
-i item Select input item.
-w "Whisper" data, when no FX is present.
-x spitem Use external excitation from given speech item (must be 10kHz).
-m Use voice mix track to control degree of periodic excitation. Designed for use with output of vdegree(SFS1) program.
FX.xx Fundamental frequency contour, used for voice-switch and Fx.
19-channel energies generated by "voc19".
SP (External excitation mode) Input signal to filter.
TR (Optional) Voicing mixture track (see vdegree).
SP Speech waveform at 10kHz.