How does it work?
The string driver generates an alternating magnetic field from the guitar pickup signal.The string vibration is amplified when positioning the head of the Guitar Resonator near the strings. This vibration feeds back through the pickup so that a closed loop accurs:
With it you can create amazing feedback that sounds very natural because it comes directely from the strings. Thus the sound is not as 'false' as electronically generated feedback gadgets. The GR's sound totally natural. Just like a turned up amplifier where the string feedback comes from the sound waves.
Feedback is possible at any sound volume, even if playing with headphones.
This also works fine with crunch or even clean sounds. It would take extrem amplifier gain to get the same feedback tones with sound wave feedback.
The transition from normal tones into feedback can be controlled precisely and always reproducible. You don't need any time wasting experiments with amplifier gain and loudspeaker distance.
With the strong magnetic field, you can generate extreme feedback harmonics that cannot be generated with normal amplifier speaker feedback.