The software offer you two resizing modes + the channel mode option. Resizing modes: VBR mode and CBR mode. The recommanded option is the variable bitrate mode(VBR Mode). With the channel mode option, user can downgrade the channel mode from stereo, j-stereo to mono for saving more memory, but is not recommanded for the quality of sound.
Portable Mp3 is using current version of Lame: 3.97, the quality of speed and sound of Mp3 encoding.
Easy to use & friendly interface, drag & drop support.
In four words, same memory, more music!