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I have never noticed this, but some of the adx decoders I found were substandard, many completely changed the rms volume (Bero's one came to mind) or had garbled results with non 44100 files.
The most accurate one I found was ADX_Conv.exe which was an ugly GUI based decoder, but gave perfect volume levels for all sample rates. Encoding must be done with adxencd.exe and nothing else.
The method of downsampling may also make a difference, I strongly recommend sox (sox.soundforge.net) not only because it makes batch mode easy but the high quality polyphase filter is great.
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