Hey I'm working on this synth patch for a performance, and I can't get rid of theses audio pop when the amplitude enveloppe is triggered, the only thing i'm using is a line object to control a ramp from 0 to 1, is there anything else I should know about amplitude enveloppes in pure data ?

Noob question here, does the data flows both way ? like can I send data to arduino via the comport object to control a led ?