Two Notes Audio Engineering is a registered trademark of musical equipment and professional software for guitarists, bassists, studio and live sound engineers, manufactured by Orosys, located in Saint-Gély-du-Fesc on the outskirts of Montpellier.

The brand specializes in the design of digital Loadbox , speaker simulators and computer- aided music software . Notable musicians and sound engineers such as Richard Zven Kruspe (guitarist of the Rammstein and Emigrate group ), Norbert Krief (guitarist of Trust and Johnny Hallyday ), Robin Le Mesurier (guitarist of Rod Stewart and Johnny Hallyday ) 1 , Pete Thorn (who accompanies Mylène Farmer in particular) 2 , Eero Heinonen (bassist of The Rasmus ), Jeff Loomis (guitarist of Nevermore ) and Buck Dharma (guitarist of Blue Öyster Cult ) use products Two Notes Audio Engineering live and studio.