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Tony, have you successfully done this? The AC line frequency is stable, but I don't think it's that stable. Seems like it would be awfully hard to achieve "sync" and once you did, it might drift out before long. Also the waveform of the hum would be influenced by the guitarist moving around and other random thiings that would be hard to replicate on a second pass. In the end the noise might increase rather than cancelling out.
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