1) Sound production technology 
Penteo Surround, Inc. (Penteo) is a digital audio software vendor that markets ADL’s Penteo 4 Pro: a stereo-to-5.1 surround, and stereo-to-Left/Center/Right up-mix software plug-in. As an up-mixer, Penteo 4 Pro transforms any stereo recording, soundtrack, DJ mix or live television broadcast into surround sound. Penteo claims that its technology ...