I thought about that, ADSR is the most popular type that would cover i thing about 70% of devices. I might create that one anyway and then move to a universal component.
The problem i’m facing with all that in mind is how to limit a point on the canvas, it sometimes need to be dependant on other points and sometime it needs to move freely around. Also one point can alter the position of ALL points, for example in a ADSR envelope if you move the attack point all others should follow it, that is keep the same distance from the attack point, but some envelopes need for the points to stay in place.