Speaking of log amps etc, I have successfully used an analog mux with code. The reason I prefered this was one can set the threshold for the gain change(up or down). I then included the gain setting as a nibble in the data file. When I compiled the data I normalized the data to the lowest gain. Worked well. Barry _____________________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>