After his Abitur he studied violin at the Academic Academy of Music in Berlin, first with Joseph Joachim and Andreas Moser, then piano with Ernst Rudorff and Georg von Petersenn and finally conducting with Robert Hausmann.
In 1908 Weisbach moved to Munich, where he worked as a trainee Kapellmeister at the court theatre there, now the Bavarian State Opera under Felix Mottl, and at the same time attended further lectures at the Ludwig-Maximilians-Universität München.
After a short episode in Worms, where he took over the direction of the Konzertgesellschaft in 1913, and in Wiesbaden as well as a break due to the war, he was elected municipal music director of the Philharmonisches Orchester in Hagen/Westphalia in 1919, where he conducted the world premiere of Paul Graener's Concerto for Piano and Orchestra (op.
His first major appearance with the Düsseldorfer Symphoniker [de] and a demanding programme at the opening ceremony of the Great "Ausstellung für Gesundheitspflege, soziale Fürsorge und Leibesübungen" (Exhibition for Health Care, Social Welfare and Physical Exercise) (GeSoLei) was a highly acclaimed success.
36 and the Requiem by Lothar Windsperger, the Marianische Antiphon for solos, choir, organ and orchestra by Wolfgang Fortner and Die Weihe der Nacht by himself as premieres as well as Le Roi David by Arthur Honegger, the Stabat mater op.