Years ago (as a interested, very amateur hobbyist) I built a Lehman = Seismograph, but for a long time I have not had it in operation. I = decided to turn my old seismograph on again to show some young friends = that have an interest in seismology. I decided to update Amaseis also. I = am surprised and confounded by the initial results of my "homemade = Lehman" using it with the new version of AMASEIS. To get the trace "on = screen" I had to set the zero level to approximately 28,000 instead of = 2048 and the trace is extremely volatile as I approach the seismograph = with it's peak hitting a height of about 2 hours (above and below the 0 = line, with a gain set at 20 [and no event happening]). I was wondering = if there is anything that is glaringly wrong you might advise me on. = Thanks a lot . Ed.=20Years ago (as a interested, very amateur hobbyist) I built a Lehman=20 Seismograph, but for a long time I have not had it in operation. I = decided to=20 turn my old seismograph on again to show some young friends that have an = interest in seismology. I decided to update Amaseis also. I am surprised = and=20 confounded by the initial results of my "homemade Lehman" using it with = the new=20 version of AMASEIS. To get the trace "on screen" I had to set the = zero=20 level to approximately 28,000 instead of 2048 and the trace is = extremely=20 volatile as I approach the seismograph with it's peak hitting a height = of about=20 2 hours (above and below the 0 line, with a gain set at 20 [and no event = happening]). I was wondering if there is anything that is glaringly = wrong you=20 might advise me on. Thanks a lot . Ed.