Quadra as a clock syncable LFO?

the question is simple : Can I Sync the LFO mode from quadra to the clock of my sequencer ?

Kind of. You can restart the functions in cycle (LFO) mode using the Trig inputs, but you will have to adjust the timing of the attack and decay controls to get it in the pocket with your sequencer. This also means that the downbeat of your clock will always restart the LFO at 0.