Caveat: Digital noise is flawed. Having said that, how 'less flawed' can we make it? Specifically with gen objects. (apologies to Mr. Castine)
Most digital noise circuits involve a linear feedback shift register's output of 0s and 1s being smoothed / filtered into various noise types. The most known source is the MM5837 (Buchla's Source of Uncertainty) which features a 17-bit LFSR. Unfortunately it's almost a joke to consider this chip pseudo-random, as you can hear it repeating after only a few seconds. But it does make for a decent jumping off point.
I've emulated the MM5837 within Gen along with a typical filtering 'circuit' for outputting white noise. The result is definitely not white noise. The LFSR section is easily improved (experiment with length and taps), but it's the filtering section that could be the downfall. I included some comments explaining what's going on in the Gen subpatch in case anyone has any improvement ideas.