From 1832 until 1932, the firm produced mechanical musical instruments of the highest quality. The firm's founder, Michael Welte (1807-1880), and his company were prominent in the technical development and construction of orchestrions from 1850, until the early 20th century.
In 1872, the firm moved from the remote Black Forest town of Vöhrenbach into a newly developed business complex beneath the main railway station in Freiburg, Germany. They created an epoch-making development when they substituted the playing gear of their instruments from fragile wood pinned cylinders to perforated paper rolls. In 1883, Emil Welte (1841-1923), the eldest son of Michael, who had emigrated to the United States in 1865, patented the paper roll method (U.S. Patent 287,599), the model of the later piano roll. In 1889, the technique was further perfected, and again protected through patents. Later, Welte built only instruments using the new technique, which was also licensed to other companies. With branches in New York and Moscow, and representatives throughout the world, Welte became very well known.
The firm was already famous for its inventions in the field of the reproduction of music when Welte introduced the Welte-Mignon reproducing piano in 1904. "It automatically replayed the tempo, phrasing, dynamics and pedalling of a particular performance, and not just the notes of the music, as was the case with other player pianos of the time." In September, 1904, the Mignon was demonstrated in the Leipzig Trade Fair. In March, 1905 it became better known when showcased "at the showrooms of Hugo Popper, a manufacturer of roll-operated orchestrions". By 1906, the Mignon was also exported to the United States, installed to pianos by the firms Feurich and Steinway & Sons. As a result of this invention by Edwin Welte (1876-1958) and his brother-in-law Karl Bockisch (1874-1952), one could now record and reproduce the music played by a pianist as true to life as was technologically possible at the time.
Welte Philharmonic Organ 
From 1911 on, a similar system for organs branded "Welte Philharmonic-Organ" was produced. Thirteen well-known European organist-composers of the era, among them Alfred Hollins, Eugene Gigout and Max Reger were photographed recording for the organ, distinguished organists like Edwin Lemare, Clarence Eddy and Joseph Bonnet were recorded too. The largest Philharmonic Organ ever built is in the The Salomons Centre of the Canterbury Christ Church University. This instrument was built in 1914 for Sir David Lionel Salomons to play not only rolls for the organ but also for his Welte Orchestrion No. 10 from about 1900, which he traded in for the organ. One of these organs can also be seen in the Scotty's Castle museum in Death Valley where it is played regularly during museum tours. An organ built for the HMHS Britannic never made its way to Belfast due to the outbreak of the First World War. Today is it playing in the Swiss National Museum in Seewen.
Welte Inc. 
In 1912 a new company was founded, the "M. Welte & Sons. Inc." in New York, and a new factory was built in Poughkeepsie, New York. Shareholders were predominantly family members in the U.S. and Germany, among them Barney Dreyfuss, Edwins brother-in-law.
As a result of the Alien Property Custodian enactment, during the First World War, the company lost their American branch and all of their U.S. patents. This caused the company great economic hardship. Later the depression and the mass production of new technologies like the radio and the electric record player in the 1920s virtually brought about the demise of the firm and its expensive instruments. Other companies with similar products like American Piano Company (Ampico) and Duo-Art also began to fade from the scene at this time.
From 1919 on, Welte also built theatre organs, in particular for installation in cinemas. With the introduction of "talkies" around 1927, the demand for these also began to diminish, and by 1931 production of such instruments had been severely curtailed. The last big theatre organ was a custom-built instrument for the Norddeutscher Rundfunk (NORAG) broadcasting company in Hamburg, still in place and still playing today. A number of other Welte theatre organs survive in museums.
In 1932 the firm, now with Karl Bockisch as sole owner, barely escaped bankruptcy, and began to concentrate on the production of church and other speciality organs.
In 1936, a prototype of this type of organ was demonstrated at a concert in the Berliner Philharmonie. The production of these organs - in cooperation with the Telefunken Company - was halted by the Nazi-government because the inventor, Edwin Welte, was married to Betty Dreyfuss, who was Jewish.
The business complex in Freiburg was bombed and completely destroyed in November 1944. This event seemed to obliterate the closely kept secrets of the firm and their recording apparatus and recording process appeared lost forever. But in recent years parts of the recording apparatus for the Welte Philharmonic-Organs and documents were found in the United States. It was then possible to theoretically reconstruct the recording process. The Augustiner Museum of Freiburg keeps the legacy of the company - all that survived the Second World War.
- Ossip Gabrilowitsch plays for Welte-Mignon on July 4, 1905 Johannes Brahms Intermezzo in C major, Op. 119, No. 3 * listen (help·info)
- Arthur Nikisch plays for Welte-Mignon on February 9, 1906 Johannes Brahms Hungarian Dance No. 5* listen (help·info)
Welte Mignon made several organs for important churches as did Welte-Tripp. One of the last surviving instruments is in the Church of the Covenant, Boston Mass. This was restored by Austin several years ago - supposedly to the original state. It was altered by an organist in 1959 or 1960. Until that time it has been careful restored and releathered by the Reed-Treanor organ company. This included the entire combination action in the console and the manual relays in the church basement and the repair of the massive 25 HP DC motor that powered the Spencer Turbine blower. During the two years they cared for the organ no tonal or structural changes were made.
- The Pianola Institute: "The Reproducing Piano Welte-Mignon"
- Autogramme berühmter Meister der Tonkunst. Freiburg, New York, 1914 (undated), p. 57 -85
- WELTE restored. Royal Academy of Music, 2011
- Christoph E. Hänggi: Die Britannic-Orgel im Museum für Musikautomaten Seewen So. Festschrift zur Einweihung der Welte-Philharmonie-Orgel; Sammlung Heinrich Weiss-Stauffacher. Hrsg.: Museum für Musikautomaten Seewen SO. Seewen: Museum für Musikautomaten, 2007.
- Wie von Geisterhand. Aus Seewen in die Welt. 100 Jahre Welte-Philharmonie-Orgel. Museum für Musikautomaten, Seewen (SO), Switzerland, 2011. ISBN 978-3-9523397-2-5
- Gerhard Dangel: The history of the Welte family and the house of M. Welte & Sons. In: The Pianola Journal, No. 18, London 2007, p. 3-49. ISSN 0952-6323
- Gerhard Dangel und Hans-W. Schmitz: Welte-Mignon piano rolls: complete library of the European recordings 1904 - 1932 for the Welte-Mignon reproducing piano. Welte-Mignon Klavierrollen: Gesamtkatalog der europäischen Aufnahmen 1904 - 1932 für das Welte-Mignon Reproduktionspiano. Stuttgart 2006. ISBN 3-00-017110-X
- Automatische Musikinstrumente aus Freiburg in die Welt - 100 Jahre Welte-Mignon: Augustinermuseum Freiburg, Exhibition from September 17, 2005 to January 8, 2006 / [Ed.: Augustinermuseum]. With contrib. by Durward Rowland Center, Gerhard Dangel, ... [Red.: Gerhard Dangel]. Freiburg : Augustinermuseum, 2005.
- Hermann Gottschewski: Die Interpretation als Kunstwerk: musikalische Zeitgestaltung und ihre Analyse am Beispiel von Welte-Mignon-Klavieraufnahmen aus dem Jahre 1905. Laaber: Laaber-Verlag 1996. ISBN 3-89007-309-3
- Charles David Smith and Richard James Howe: The Welte-Mignon: its music and musicians. Vestal, NY: Vestal Press, 1994. ISBN 1-879511-17-7
- Quirin David Bowers: Encyclopedia of automatic musical instruments: Cylinder music boxes, disc music boxes, piano players and player pianos... Incl. a dictionary of automatic musical instrument terms. Vestal, N. Y.: The Vestal Press, 1988.
- Gerhard Dangel: Geschichte der Firma M. Welte & Söhne Freiburg i. B. und New York. Freiburg: Augustinermuseum 1991.
- Peter Hagmann: Das Welte-Mignon-Klavier, die Welte-Philharmonie-Orgel und die Anfänge der Reproduktion von Musik. Bern [u.a.]: Lang, 1984. Online-Version 2002
- The Welte-Mignon portal for reproducing pianos
- Complete listing of all Welte-Mignon-Rolls
- A discussion of the Welte-Mignon, in English, published by the Pianola Institute, London, with many illustrations and audio examples www.pianola.org
- The Player Piano Group - the UK's main Player Piano society
- The Pianola Forum - online discussion group
- The International Association of Player-Piano, Roll-Playing and Automatic Instrument Enthusiasts
- Musical Box Society International
- The Welte Organ at Salomon Campus, Canterbury Christ Church University College
- The Restoration of Sir David Lionel Salomons Organ in Royal Tunbridge Wells
- (German) German Society for self-playing instruments / Gesellschaft für selbstspielende Musikinstrumente e.V.
- (German) Welte Wireless Organ Hamburg
- (German) Das Welte-Mignon-Klavier, die Welte-Philharmonie-Orgel und die Anfänge der Reproduktion von Musik by Peter Hagmann (1984)
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