<p> India&rsquo;s most talented director Mani Ratnam&rsquo;s forthcoming bilingual project <em>Duet</em> is nearing completion. The unit recently completed a long schedule in Serbia. The film&rsquo;s post-production activities will begin soon.</p> <p> &nbsp;</p> <p> Mani is planning to launch the film&rsquo;s audio in February, 2017. Tamil star Karthi and Bollywood girl Aditi Rao Hydari are playing the lead roles in the movie. Rahman started scoring music.</p>