No modification to the instrument, no holes to drill. Stunning sound quality! NEW, the Kremona violin/viola pickup is a professional quality piezo sensor that offers natural sound quality and ease of installation at a highly affordable price. The pickup element simply pushes into the C/G- or E-string side bridge slot and is held in place by string tension. The input jack housing is lined with soft, protective cork, as are the feet of the adjustable clamp legs. Detachable and portable, the Kremona VV-2 conveniently accepts a 1/4" cable jack. An onboard potentiometer allows adjusting of output volume from the stage. The Kremona KV2 is a passive pickup which will produce solid results into most electric or acoustic guitar amplifiers. Due to design factors inherent in P.A. mixers (and these vary considerably), if you are running straight into a P.A., then a Preamp/ DI may be necessary to boost line signal strength and lower the impedance so that the mixer receives a proper signal. The pickup will operate with any preamplifier designed for piezo pickups. If you have any questions, feel free to ask!