He took up flute in his early teens, and was a private student of Abe Kestenberg (who also taught at the McGill Conservatory of Music), and Gail Grimstead at the Conservatoire de musique du Québec à Hull from which he graduated with a Premier Prix in 1977.

Upon leaving the Conservatoire de Paris in 1980, Beauregard joined the Ensemble InterContemporain under Pierre Boulez as first flute.

His performance of Edgard Varèse's Density 21.5 is included on Sony Classical's Flute – Greatest Hits CD.

After Beauregard's death in 1985, friend and fellow flautist Pierre-André Valade [fr] recorded the solo part and included the completed work on his CD (ADDA 581075), as did Claire Marchand on her CD 20th Century Works for Solo Flute (ATMA Classique ACD22175).

In the early 1980s, Beauregard was deeply involved in computer music research at the recently established IRCAM, modifying a flute with optical switches so that it could interface with the 4X computer-based audio synthesis and processing system.