el.pole(p, x)

Implements a simple one-pole filter, also sometimes called a leaky integrator. Expects two children, the first is the pole position, the second is the signal to filter.

Difference equation: y[n] = x[n] + p * y[n-1]

Reference: https://ccrma.stanford.edu/~jos/filters/One_Pole.html (opens in a new tab)