So I had started this six months ago, prototyping hardware and software, but only had the inspiration to finish it this week.
PT2399 modulated delay line with microcontroller. Several LFO shapes with smooth blending between each-one. Also a dedicated knob to blend in either high or low frequency random variation, depending on which direction from center you turn the knob. Depth, speed and mix knobs are self-explanatory. Also relay bypass switch and tap tempo.
A couple hidden features! If I hold down the tap switch for more than a second, I can "trim" a sort of skew into the LFO using the random knob. Also by holding down the bypass switch for more than a second, I can "draw out" a custom LFO using the shape knob by twisting it for up to a few seconds. It sort of records that knob twisting and plays it back as a new LFO. Speed and depth work with it as normal, and it resets to the normal default LFO shapes if I twist the shape knob again for more than a few degrees (to prevent accidental erasure by knocking the knob). The "reset" is still a bit buggy, I have to fine tweak the code.
Color is a bit too yellow. Was going for more of a moon/bone color.
An older video of the sounds. Settings are extreme, but it can do subtle too.
Video showing off some of the software work I did, blending between LFO shapes and morphing/skewing.
Bonus photo, this is how I usually draw the designs that go on my pedals (or otherwise). Watch movies and doodle!