Which psymodel should I use with toolame or MP2enc?
There is much debate about both the psymodels, and the only fully correct answer is to use your own ears and judge for yourself. In both toolame and mp2enc, Psychoacoustic Models 1 and 2 are the ISO standard models. Although they are standard, they are not to be considered very high quality. However the psymodel does not have a large impact on the sound quality. In general, Psymodel 2 is considered to be of better quality, but may have problems with frequency cutoff and tonality detection. A guideline used by many users is to use psymodel 2 at bitrates less than or equal to 160 and psymodel 1 at higher bitrates. Later versions of toolame have implemented several new psychoacoustic models: psy 3 is a re-implementation of the standard psy 1 and psy 4 is a cleaned up version of psy 2. Although these versions will not sound much different from their ISO standard counterparts at the moment, there is possibility of their improvement in the future. See this page for more information on toolam
