SAN FRANCISCO (AP) — Longtime technology guru Ray Ozzie wants to bring back the emotions of the human voice to phones. The five DigitalGlobe workers who installed the app in July as part of Talko's testing didn't use it much initially, partly because they were so accustomed to texting and emailing each other or trying to schedule a conference call when they needed to talk, said Ed Locher, DigitalGlobe's senior vice president of corporate marketing. Ozzie isn't under the delusion that voice messages are going to supplant popular communications apps such as WhatsApp, Snapchat and Tango, which combine texts and photo sharing. Last week, his San Francisco startup incubator, Giant Pixel, released an iPhone and iPad app called Sobo that offers a vocal twist to Twitter, the popular short-messaging network. In the 1980s, he played a key role in creating a suite of document-sharing tools at Lotus Development Corp., now owned by IBM Corp.