Schöllnast, the csakan was primarily an amateur instrument, purchased by those who wanted something simple and inexpensive, however there were also accomplished professionals, such as Viennese court oboist Ernst Krähmer (1795–1837) who toured as far afield as Russia, playing the csakan with acclaimed virtuosity. Around 400 works for the csakan were published in the first half of the nineteenth century, mainly for csakan solo, csakan duet or csakan with guitar or piano. The csakan's repertoire has not yet been fully explored. Notable composers for the instrument include Heberle and Krähmer, and Tarasov notes that piano works by Beethoven were arranged for csakan and guitar (Beethoven is reported to have owned a walking-stick csakan). Modern recorder makers such as Bernhard Mollenhauer and Martin Wenner have made csakan copies. Similarities in fingering and design make the csakan at least a close relative of the recorder. Accounts of Krähmer's playing, which report his "diminishing and swelling the notes, up to an almost unbelievable loudness" imply a developed technique using shading and alternate fingerings, far beyond a purely amateur culture of house music. Additionally, Tarasov reports that some recorders by Baroque makers were modified, around 1800, through the addition of keys, including a J. C. Denner (1655–1707) basset recorder in Budapest and an alto by Nikolaus Staub (1664–1734) with added G keys, like the D key on a baroque two-key flute. Another modification is the narrowing of the thumb hole, by way of an ivory plug on the J. C. Denner basset and an alto by Benedikt Gahn (1674–1711), to allow it to serve purely as an octaving vent, as found on many flageolets and csakans. These changes may be archetypal to those found on csakans and flageolets, and constitute an inchoate justification for the continuous development of the Baroque recorder into its nineteenth-century relatives. Modern revival The "revival" The concept of a recorder "revival" must be considered in the context of the decline of the recorder in the eighteenth and nineteenth centuries. The craft of recorder making was continued in some form by a number of families, such as the produced by the Oeggle family, which traces its lineage to the Walch family of recorder makers the careers of the Schlosser family of Zwota. Heinrich Oskar Schlosser (1875–1947) made instruments sold by the firm of Moeck in Celle and helped to design their Tuju series of recorders. The firm Mollenhauer, currently headed by