HPL2 is a professional binaural conversion technology HPL used by some Japanese label that produces high-quality high-resolution music when producing a sound source version for headphones.
By using this HPL2 Processor plug-in, you will be able to listen to the same mix-balanced sound as you listen to a 2-ch stereo sound source with a speaker, even with headphones or earphones.
Originally the music sound source is made to be comfortable for the speaker. Realizing with the headphones and the earphone without breaking the mix balance is very important to obtain the original sound. It is not an effector that adds something and makes it pleasant. It play original good sound correctly even with headphones and earphones.