VCO CEM problems.

[BJ]

There have been discussions about power supplys here a time 
back.

Are there any one that have had problems with a LFO switching
that are make interference to a VCO module.
The VCO are a CEM 3340, or more likely there are 3 of them on
the same PCB.
My design are very carefully laid out on the PCB.
The VCO are changing in frequency wery wery slightely!

The LFO have separate Regulators7805/7905 and 220µF filter
capps.The 2 PCB's are runing from the same supply.
The supply can deliver +/-2A.
The VCO PCB have no regulators but 440µF on both rails.

The LFO design are a basic Integrator type.
LFO design are made with CMOS.

Is this solwed with a separate supply for the VCO PCB,
does any builder on this list run their modular system with
separate supplys for different modules to gain for highest performance.

I have tried to decoupling the boards with separate 1000µF capps, but
the supply don't stay stable?????

The Lab supply are all OK, i have made a check on it!

Perhapps the CEM master have some clue?
Asks BJ in sweden.