Idea: Zadc internal noise generation

[tgrey]

I think it'd be incredibly useful if zadc generated it's own "noise" scaled to 8-bits when it gets clock signals if no CV is patched to the input.

This would allow zadc to be used as a source of random triggers with nothing other than the clock.

[collidermod]

I had gone down a rabbit hole a couple months back, reading about how systems from the 1970's would generate clocked noise/random values. That would be a perfect fit for this, and would require no UI changes to do so. I'll take a look at this as it's a solid idea.