WE are Asian Passion'', cooed Janette de Ramos, Vilma Gardiner and Tess de Ramos in unison, somewhat stressing the obvious. And we were merely inquiring what they were all about. The three sultry sisters who have been delighting audiences in nightspots all over the world with their music, stage presence and beauty (though not necessarily in that order) will be at hot-hip night spot JJ's from April 26 for a limited engagement. They are jamming-in for regular band CC Ryders who will be making musical waves of their own on tour in Indonesia. Filipino-born but Hongkong-based, the trio have also performed as back up artists for Canto-pop icons such as Sally Yeh, Anita Mui and Alan Tam.