WIthout sustain, as long a note is still being held down, the LFO will not reset phase.
With sustain, once there are no more notes being physically held down (ie: all NoteOffs have been called and counted), while holding sustain down a phase reset triggers on the next NoteOn, thus affecting every audible note with for example, a filter linked to the global LFO.
example patch here: http://djtbmx.stdrand.com/junkpile/TBG% ... 0Redux.hxp
Though maybe this may be half the answer to true free-running global LFO's, just a thought.
Thanks in advance.