I think it's possible to decode an SQ LP in the computer. And I think with enough work, someday a software decoder could be built to be as good or better than a tate, because a software decoder would have the advantage of not having to be realtime. Anyways, I've started work on this possibility, and I'm getting results of something like a very bad non logic decoder. By studying test tones from a test record, I figured out that the rear info is on both channels, the right channel lagging by about .01s. In phase for right, out of phase for left. so, by adding .01s to the right speaker (this has to be just exact, it's not exactly .01, but it's not .011 or .009, I got the exact by measuring it with the testtone, and cutting and pasting that time), then using dartpro I added and subtracted, thus getting rear channels. Then, on a whim, I added and subtracted the rears and surprise surprise, I got fronts. The left to right seperation is decent, but the front to back seperation is about 3dB at the most on the test tones, so this is probably even worse with music. I tested it with a song, and it's kinda seperated, but not enough to be worth anything. This is probably what the first non logic decoders sounded like. Anyways, I've got a start here, if I could just get my hands on technical info on the SQ system, how a tate works so well, and the like, I could probably improve this method. I think we can all agree a software tate would be a great thing for all, except those who own one and want to make their money back someday on ebay. Anyone with suggestions, please post. Thanks.