I am not a poker player, but I am an audiophile, and I use a variety of "tells" as my prime tools in critical listening. You know my worn-out line: "You can't hear what you're not listening for."
I use tells extensively during speaker placement. I use them most extensively, though, when installing and aligning phono cartridges. In that process, tells are a necessity because achieving the best possible sound depends on knowing when I have achieved the best possible sound.
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