Olfen is a town in North Rhine-Westphalia. . The current Basilica of St. Vitus was built between 1870 and 1880 because the previous Gothic church became too small. Only the historic baptismal font and individual ornaments in the masonry have been preserved from the old church, which were integrated into the new building. Today's large and simple church, which was originally intended to have an architecture similar to that of Cologne Cathedral. Until 2015 the Church housed a 2-manual organ from the Fleiter company, which, however, from 1925 onwards was considered to be inferior and not space-filling due to many conversions and baroque renovations. At that time, this small but highly valued organ had a warm and romantic sound, which was lost in 1925 and 1975. 

Thanks to the efforts of many people, it was decided to build a new instrument. The work was entrusted to the organ builder Merten from Regmagen. It was inaugurated in 2015 and is designed as a 2-manual organ with 49 stops and divided into 4 divisions. On closer inspection, the division of the organ's works is slightly similar to the ''Hamburger Prospekt'' published by Arp Schnitger. The organ was designed to follow the original Romantic concept of the Fleiter company (1883), but there are many French influences in its composition. One could say that in the organ 3 quite different concepts are brought together. It is most visible in the Schwellwerk with its full reed choir (trompette harmonique 8', clarinet 4', oboe 8', clarion 4'), and a celesta register (voix céleste 8'). At the pedal we don't find a trombone, but a trombone 16′ built by Willis. The Hauptwerk section shows further French influences with its Flûte harmonique 4′ and the banked cornet V (from c1). The Hauptwerk also contains a number of original Fleiter-built flute registers as well as many British registers. This interesting mix results in a unique composition where each section has its own character and each of them contributes a lot to the full organ sound. They differ not only in their different acoustic locations, but also in their origin and intonation as well as the conception. A very useful addition to the disposition are the 12 coupler registers, which give the organist a deafening experience when all couplers are switched on!

All in all, this organ is one of the few universal organs in the diocese, thanks to the registers coming from Lancaster that have been adapted to the Fleiter organ and the Baroque- Styled mixtures, this organ has become a real one-off.