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> >22kHz is a bit high for a 44.1kHz sampling rate - the high frequency > >limit is one half the sampling rate... > > > I don't quite understand (for a change. <g> ). Could you explain that > again, please? In the world of digital sound recording and transmission there is what's called (I believe) Shannon's law (many years since I was in school) which says the highest frequency that can be digitized is one-half the digital sampling rate. Thus a 44.1kHz sample rate system can only go up to 22.05kHz. Then there are anti-aliasing low-pass filters to enforce this, but they are not perfect so there's some gradual decline in frequency response before hitting the actual cutoff point. Since in this case you are only 50Hz away in practice there will not be much left of your signal after going through this filter. For what it's worth any decent analog tape recorder running at 15 ips (inches per second) or faster would record this quite well. Or if you could sample at 48kHz you might have a chance of getting it that way too. I don't know what software might be available for the Thinkpad at that sample rate though. The next step in commercial systems looks like a 96kHz sample rate - if this eventually finds its way into notebook computers you'd have no trouble at all, but that's probably a year or two away. Billy Y..