el.env(atkPole, relPole, x)

A one-pole envelope follower node with different attack and release times. This is quite similar to el.pole(p, el.abs(x)) in implementation. Expects three children, the pole position for the attack phase, the pole position for the release phase, and the signal to monitor. For example,

el.env(el.tau2pole(0.01), el.tau2pole(0.1), x)