Vol. 2 Reger Organ Works on 143 ranks: Phantasie uber den Choral Wachet auf, ruft uns die Stimmel, Op. 52, Nr. 2; Variationen und Fuge uber ein Originalthema, op. 73; from Op. 59: Pastorale, Intermezzo, Canon, Toccata und Fuge. Martin Sander plays the 1883 Walcker at the Cathedral in Riga, Latvia, claimed the largest organ in the world when it was built. Now completely restored, it includes such unique capabilities as a swell pedal which changes the wind pressure on the Oboe-Fagott to vary its power and tone color, demonstrated in the Pastorale.