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Even with modern devices they seem to be a challenge forprofessional musisicians. At that time clarinets had five technically questionable keys. It is hard to believe that youcould play that music with those instruments at all, but it need to have been possible, as the critics were excited andyou must never think that they did not know what quality in tool making and gambling was it was the time when stringinstruments like Stradivari violins were built. With every new musical and technical problem craftsmen and players strived to superior the new and by far not best instrument. This development is akin to organic evolution of living species. Usually it was in small steps, shows forking, interdependencies of workshops and infrequently dead ends.