From that article: Mp3 to Ogg Ogg -q6 was required to achieve transparency against the (high-quality) mp3 with difficult samples.
I used -q8 (or higher) when transcoding with oggenc(1); I've done extensive testing by transcoding back-and-forth to different formats (including RIFF WAV) and have never noticed any decrease in audio quality or frequency response, even when measured with a spectrum analyzer. I do value your point, though.
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