Volume pot to VR with signal bleed.

[antonis]

All of the controls on the control board should be connected to ground rather than Vref.

+1 

Actually, to signal ground..
(which shoulf be routed apart from power ground, regardless of circuit current consumption and trace/wiring lenght..)

[POTL]

All of the controls on the control board should be connected to ground rather than Vref.

+1 

Actually, to signal ground..
(which shoulf be routed apart from power ground, regardless of circuit current consumption and trace/wiring lenght..)

Fine. Can you draw a diagram of how to separate the ground? Signal ground from power ground. how to separate the ground of an analog LFO. How to separate the ground of digital microcontrollers that can drive LFO or bypass? I have seen many vintage and boutique circuits, but they all have a common ground for all circuit nodes.

[FiveseveN]

Bit more involved than a diagram but...