 It was revised in 1992, 1994 and 1997.The slider chests instrument has 52 registers on three manuals and 32 pedals.Around the 1st century BC La Tène culture, archaeologists excavated individual and aerial finds of the Celtic-Helvetii oppidum Lindenhof, whose remains were discovered in archaeological campaigns in the years 1989, 1997, 2004 and 2007 on Lindenhof, Münsterhof and Rennweg-Augustinergasse, and also in the 1900s, but the finds mistakenly were identified as Roman objects.