>>334
--nspsytune
uses Naoki Shibata's advanced psycho accoustic model enhancements. Improves many things:

1. Method to calculate tonality
2. Method to calculate ATH
3. Use -X0 and 'careful noise shaping' when encoding in CBR mode
4. Method to switch between long and short block
5. Allocates more bits to short block in which attack exists
6. Method to calculate masking in mid-side stereo
7. Method to switch between midside stereo and regular stereo frames
8. Better bitreservoir handling

Allows lower bitrates and is overall more efficient and quality yielding than the default LAME gpsycho. Fixes problems on most of the hardest tracks and solved all JS problems I know.

--athtype

slightly adapted ATHtype compared to 3.89 and 3.88. principles

以下リンクより引用
http://users.belgacom.net/gc247244/quality.htm