beta distribution, takes a {0..1} and b {0..1}, both can be bpf.

cauchy distribution, takes sigma and mu

exponential distribution
direction - can be :decreasing, :increasing, or :bilateral
lambda - affects exponential curvature (can be bpf, must be > 0.0)

gaussian distribution, takes sigma and mu

linear distribution from 0.0 to 1.0 (if direction 1), or 1.0 to 0.0 (if 
direction -1)

triangle distribution

uniform random generator with range 0.0 to 1.0

weibull distribution, takes s {0..1} and t (>0), both can be bpf.