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Altering coherence level of noise_stim

Hi all,

OS: Win10
PsychoPy version: v2021.2.3

What are you trying to achieve?:

My Noise_stim is a square containing an equal ratio of pixels in the specified color and its contrast-color. Is it possible to change the displayed ratio (from 50/50 to 80/20 for the color-pixels)?
I’d like to alter this trial-by-trial, but i didn’t find the parameter to manipulate this attribute of the stim in the builder.
I tried consulting the documentation for both builder and coder, but didn’t find a equivalent parameter to do so.

I’m using binary noise, is there another type which is more fitting?

Thank you very much!