Violinists who want to practice without disturbing the neighbors will appreciate Yamaha's Silent Electric Violin. Yamaha replaced the internal amplification cavity of a wood violin with a battery-powered processor. You listen to yourself on headphones; just hit the "reverb" switch to make it sound as if you're playing Carnegie Hall. To perform a duet with Isaac Stern, connect the $695 SV-100K to a CD player. (616) 940-4900

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