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I've had decent luck experimenting with making a "distant" sound with just processing:
A bit of lowpass filter (not too aggressive, but obvious enough) to dull it, and leave other sounds in the mix more prominent.
Reverb with a semi-long initial decay and dense reflections. The idea is to suggest that there was plenty of space between the sound and the ...
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Great answers so far. I suppose if you have the chance to Worldize it that might be worth a go too!
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