Dubach began studying violin under Elisabeth Schöni at the age of 7. Within two years, he won the Concours National of the 1964 EXPO in Lausanne, followed by appearance on television and radio around Switzerland. He proceeded to study under Eva Zurbrügg, Ulrich Lehmann, Yehudi Menuhin, Nathan Milstein, Magda Lavanchy and Salvatore Accardo.
At the age of 16 he won the Migros study prize and completed his studies at the Conservatoire in Fribourg "summa cum laude". His talent was recognised in international competitions, including Senigallia, Sion, Vienna, Naples, Gernsbach, Freiburg and Vercelli, where he won 1st prizes, including the coveted ”Premio Rodolfo Lipizer“ in Gorizia (I). In 2000 the town of Thun awarded him their prize for culture.
In 2007 Dubach performed the Swiss national premiere of Niccolò Paganini's Third Violin Concerto. His Claves recording of Paganini’s 6 violin concertos with the Orchestre Philharmonique de Monte Carlo  has won great acclaim, including a listing in Jaoachim Hartnack’s Great Violinists of our Time.
In 2012 it was reported that he forgot a valuable Stradivarius violin he had borrowed from the befriended owner in a railway train while returning from a long concert evening. The violin was subsequently returned by the finder.
- A. Dubach about his teachers on youtube
- Lipizer 5° CONCORSO: 7 - 14 SETTEMBRE 1986, A. Dubach
- Coppey, Nicole (December 2007). "Alexandre Dubach, le 3e Concerto de Paganini joué en Suisse pour la première fois" [Alexandre Dubach: the 3rd Concerto of Paganini played in Switzerland for the first time]. Revue musicale suisse.
- Paganini Violin Concertos on Amazon, A. Dubach
- Orchestre Philharmonique de Monte Carlo
- Hartnack, Joachim W. Grosse Geiger unserer Zeit [Great Violinists of Our Time]. Zürich: Atlantis Musikbuch-Verlag. ISBN 978-3254001719.
- "Alexandre Dubach on youtube".