System expressions like
Math.random() method. Which tends to be fairly high quality ( certainly better the MST ) but doesn't allow for seeding. It's down the browser vendor to what algorithm they use for it. I believe Chrome uses an xorshift variant.
The Advanced Random plugin uses the xorshiro256* algorithm, in which we allow the developer to specify a seed ( although the default mode uses a random seed ). More advanced features of Advanced Random like perlin noise, permutation tables and cellular noise all that PRNG as a source. So are based off the seed. You can also set Advanced Random to replace the source of randomness which the System expressions use.
newt what do you mean by complex noise? We have 2D and 3D variants of Improved Perlin, Billow, Ridged, Cellular and Voronoi noise. Perlin and it's derivatives utilise Fractional Brownian Motion as well. They are all derived from a seed.