<p style="margin-left: 80px;">It is a small effect, but the whole instrument vibrates, s it all contributes to tone, sustain etc. If you think about it, its clear that the bridge transfers vibrational energy into the body, which vibrates. The strings are vibrating too , so the pickups are vibrating relative to the strings, which is bound to have an effect on the frequencies detected by the pickups. I like the Babicz bridge, whether or not you can hear the difference.</p>