//graymachine.com - Y Axis Jitter
This is from Lesson 5 of my expressions series. This creates a random jittery motion in the Y axis. You can modify probability to make or less jitter, and the pos variable to define how large the jitter is.
// Y Axis Jitter
probability = 8 ; //higher is less likely
pos = 50;
val = random(-probability-2, 1);
m = clamp(val, 0, 1);
y = wiggle(10, pos*m)-position;
value + [0, y[1]]
