Synopsis
		sfmultmask < in.rsf mask=mask.rsf > out.rsf start=n smooth=n nw=0 shift=n verb=n

Parameters
		file mask= auxiliary input file name   int nw=0 smoothing window length must be odd   bool shift=n [y/n] shift   bool smooth=n [y/n] smoothed mask [raised cosine]   bool start=n [y/n] mask from starting sample to index value in mask   bool verb=n [y/n]