why is it listed with SA voices in the description?

Product Description

Super Articulation 2 Technology using AEM technology
2-track HDR
Studio Quality Reverb
Performance Enhancing Control Sliders
Guitar Accompaniment Algorithm for realistic guitar chord sounds
New 3-layer piano, voice, guitars, drums and Motif synth sounds
LAN Port Internet Direct Connect
RGB/Video Out
32 MIDI Channels
Music Finder
One Touch Setting