The new ETSI technology (Signal Tuning Control for Variance) pertains to the efficient control of the signal from the magnetic microphone and the dual-coil magnet. The TAR company developed this technology to meet the multifaceted needs of a modern musician, aiming for efficiency under various study, creation, recording, and performance conditions.

The idea is based on the magnetic superposition of the field, related to the overlap of the windings. This allows for immediate and continuous dual control of the signal produced by the musical instrument, through the strings and the interaction of the body.

The ETSI technique has yielded an integrated system that is user-friendly and flexible, showcasing the performance, the style of the soloist, and the uniqueness of the playing method.