A idea is to make use of the common drain attributes of mosfet device, placed at the negative of a capacitor otherwise grounding.
It would see the gate higher in potential sufficient to turn the device on, than the source. The common drain offers high input impedance and low output impedance

It could therefore improve circuits, by maintaining high impedance attributes particularly where capacitors where negative is otherwise grounding, are placed in high impedance circuitry.

I tried it in a Pioneer CD player at the DAC main capacitance with good result.