With the advent of inexpensive software, just about anyone can make decent-sounding music on a computer. Performing one’s electronic opus, however, is another matter. Watching producers working laptops or triggering samplers on stage is as exciting as staring at an electronic simulation of paint drying. Until recently, computer wizards have had two ways to shake up their performances: video projection (which works best if you have a huge budget like Kraftwerk) or hiring people to play “real” instruments and/or sing. Tomorrow night, at Montreal’s Society for Arts and Technology, a group of electronic music producers will be presenting a third alternative: the use of new musical instruments which look as appealing as they sound.