 Problems caused by the tonal scheme's lack of coherence—the 1895 pipework contrasting sharply with that of 1972—and with reliability, caused by the wide variety of different types of key actions, all difficult to access, led to the decision to have the instrument rebuilt yet again.The organ was totally reconstructed in 1997 by Klais Orgelbau of Bonn, retaining the existing instrument as far as was possible and restoring it largely to its 1895 condition, although the Positive division was kept.The instrument as it now stands has 63 speaking stops over four manuals and pedals, and is built largely on the Werkprinzip principle of organ layout