Hi I ran across something called sfinfo, which, according to the docs at least is supposed to do what you're looking for. Can't say for sure cuz I'm still struggling with the audio stuff myself. Ed Hoeffner 1-271 BSBE 312 Church St. SE Mpls, MN 55455 hoeffner at dcmir.med.umn.edu 612-625-2115 612-625-2163 fax