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Old 14th August 2015, 17:33   #4
Ben Allison
Former Winamp Developer
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Join Date: Jan 2005
Location: Brooklyn, NY
Posts: 1,057
The ReplayGain scanner tries to decode the audio to stereo when calculating. It does not always work.
I was mostly done with changing the algorithm to use the new ITU-R BS.1770-3 spec (aka EBU R128), before Nullsoft fell apart. In addition to being far more accurate in its estimation of loudness, it also has downmix matrices for calculation of multi-channel material.

There are also a lot of bugs in Winamp's multichannel playback capabilities, mostly due to differences in channel ordering between codecs and standards and Winamp's mishandling of that order.
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