Well Bing says, Varrok, nothing because it doesn't have a definition feature.
But subtle suggests there's a more clever or disguised intent. A subtle sound isn't going to be loud, yes, but "quieter" would be a better word. There's nothing about a less audible burping meat saw that's "(especially of a change or distinction) so delicate or precise as to be difficult to analyse or describe" or "delicately complex and understated" or "arranged in an ingenious and elaborate way or "making use of clever and indirect methods to achieve something."
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