Unwanted fm through power supply

[Hcabnivek at aol.com]

This is my 12th attempt to post this message, all other attempts have failed.
8-O

Help! I've just finished my new quad lfo module and in doing an initial hookup
to my rack power supply for testing I find that there is a BAD fm in my two
CEM3340 based VCOs.  This occures when power from the common supply is applied
to the lfos, no patch has been made.  The fm is directly related to the
frequency of the lfos.  The lfo is a design by Klein/Hutchins (from
electronotes I guess) and comes from Ric Miller's page at
http://www.pangea.ca/~rmiller/lfov144.gif
When I add larger series resistors to the LEDs on the lfos, or disconnect the
LEDs all together,  the problem decreases but does not go away.  At worse the
vibrato imposed on and otherwise clear signal from either VCO is about a
semitone.  Adding larger caps on the VCO supply does not help. Adding large
caps (220uf) on the lfo supply does not help.  The power supply is a +/- 15v
(1.0a/0.8a) and +5v linear from Digikey #pw9954.
Any ides what is going wrong here?  It seems to me that the LFOs are at fault.
Is this design prone to exessive current drain?  Is there any way to better
isolate this module  (or my VCOs)  from the common supply?  This problem
occures even if everything else except the VCO and LFO are taken off the
supply.
Of course the LFOs seemed fine when I first breadboarded them because they
were on my beanch supply, so I didn't catch the problem until now, when this
module is basically done.
Any ideas would be apprecaited.  Thanks in advance!
Kevin