When playing with distortion I get a pulsating/vibrating effect as the chord sustains and fades off. Its very subtle but I can hear it. Equipment is listed below.

<current gear>
Epiphone Les Paul Standard+
PRS SE Custom 22
Washburn D10SK Acoustic
Peavey XXX Super 40
Boss NS-2, TU-2, MT-2, DS-1, SD-1