[chuck] Sync question

Hi ! I try to get into chuck for 2 or 3 days. I have a simple question : when you write something like : phasor p => triosc t => dac; 40 => p.freq; 2 => t.sync ... I understand that triosc is sync to phasor. But what is in sync in triosc ? Frequency, amplitude, phase, etc. I did not see any precise information about this. Or did not really understand the => meaning.... Thanks Laurent