Jitter amount can be absolute (meaning it is independent on the value-being-jittered) or relative (meaning the amount of jitter will depend on input value).
// Jitter by 0.1, regardless of input
constj= Modulation.jitter({ absolute:0.1 });
// Use jitterer with different input values
j(0); // 0.0..0.1
j(0.5); // 0.4..0.6
j(1); // 0.9..1.0
Relative jittering:
// Jitter by 10% of the input value
constj= Modulation.jitter({ relative:0.1 });
// Use jitterer with different input values
j(0); // Always 0
j(0.5); // 0.45..0.55
j(1); // 0.9..1.0. Will often be 1 because value is clamped