Synopsis
		sffourvc2 < in.rsf > out.rsf nb=2 eps=0.01 pad=n1 pad2=2*kiss_fft_next_fast_size((n2+1)/2) nv= dv= extend=4

Parameters
		float dv=   float eps=0.01   int extend=4 trace extension   int nb=2   int nv=   int pad=n1   int pad2=2*kiss_fft_next_fast_size((n2+1)/2)

Used In
		JSG          shape/beivc   SEP          vc2/elfvc vc2/beivc vc2/sigvc