Samples_to_Time
virtual Double Samples_to_Time(unsigned long cnt) const;
pad = outhdr.Samples_to_Time(
length = outhdr.Samples_to_Time(cnt);
length = outhdr.Samples_to_Time(cnt);
length += outhdr.Samples_to_Time(i);
outbuf->SetLength(outbuf->GetHeader().Samples_to_Time(nsamps));