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> I'm just trying to record a train passing by for a small project, > so if I choose 22KHz, is that the sample rate, or the other rate? That'd be the sample rate (1/2 of 44, then 11 is 1/2 of that..) so your high frequency response would be limited to half of that or 11kHz. > Or do you think 11KHz might work fine as well? This is something best determined by trying it - the fewer samples per second the less disk space is used, at the cost of the sound getting somewhat muffled. I think you'll be happier with a 22kHz sample rate though. I think what'd really be helpful is a sound recording program that can trigger the start of a recording based on a preset level of sound. That way you don't use any disk space until there is some- thing to actually record. I use this sort of thing in my work but unfortunately that's under OS9 on Motorola CPUs - there must be something for the PC that'd work on a Thinkpad though. If nothing else you could ask in the rec.audio.pro newsgroup... Billy Y..