Bengaluru-based consumer technology company CREO on Thursday rolled out a June update for its indigenous Android-based operating system "FUEL OS" which powers its flagship smartphone "Mark 1". The latest update packs in customisable audio effects which allow users to natively change sound effects, across apps and system software - be it games or streaming or listening to stored music. "With this update, we believe audio will never be the same on Fuel OS starting this June," said Sai Srinivas, CEO and co-founder, CREO, in a statement. The audio effects in Fuel OS now sports five presets - balanced, acoustic, bass boost, 3D surround sound and clear voice. These settings can be used as starting points to further fine tune the audio settings to one's liking and can be saved as multiple 'Custom Audio Effects' to work across apps and beyond.