He was a maker of wind and brass instruments, as well as of pianos, harps, and guitars.
Sax was a great instrument maker, and made sure his son had a good education and a leg to stand on for his future.
He was a careful, strict, and kind father to his son, Adolphe Sax, and played a big part in his son's successful career.
Instruments built by Charles-Joseph are held in some museum collections.