[#item_full_content]GRAZ, Austria–(BUSINESS WIRE)–USound, the leading developer and supplier of MEMS speakers for wearable and hearable devices, has announced that it has received a €10 million growth investment supporting high-volume MEMS production ramp ups for various true-wireless-stereo (TWS) earbud and over-the-counter (OTC) hearing aid customers. The investment round was led by Austria’s leading venture capital investor, eQventure, with participation from one of the world’s leading technology entrepreneur