Par ADES THOMAS. ''Still Sorrowing' - a lament which is also a homage to Romantic sentiments - proved to make the most ingenious use of a 'prepared' piano that I have heard in a long time. While a recurrent plaint tintinnabulates at the top of the piano's range and deep chords resonate at the bottom, some muffling device allows intricate figures and rhythms at mid-keyboard to rattle hollowly - a h…