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MP3 - General / Re: Resurrecting/Preserving the Helix MP3 encoder
Last post by [JAZ] -No. nspsytune means "Naoki shibata psychoacoustics tuning", and it's one of the tunings of LAME. Although currently I don't remember if they are used in the most recent versions of LAME or not.
Helix is a descendant of the Xing MP3 encoder. As you said, RealNetworks bought Xing, so it also got the encoder.
The changes that have been done to this encoder here in this topic are mostly about preserving and improving the user experience, not about sound quality (other than, maybe fixing bugs due to uninitialized variables or similar).