Audio technology company AfterMaster Audio Labs Inc. said Justin Timberlake has taken an ownership stake in the company as it prepares its launch. Hollywood-based AfterMaster , a unit of Studio One Media Inc. , said Timberlake "will play an integral role" in the company and join audio engineers and music industry veterans AfterMaster co-founders Larry Ryckman , chief executive, and Shelly Yakus, chief engineer.