EN frequency shifter

[Haible Juergen]

	> And another pro: It is not E.N., so no copyright issue.
	> And dimensioning is straight forward, if you have a simulator.
	> The E.N. network is very difficult to dimension without the
	> given tables.

Just for the record, I have the (corrected) EN table values worked into
my drawing at http://www.synthfool.com/diy/hjfs6_df.gif and
http://www.synthfool.com/diy/hjfselec.html

(I included a reference to the EN Preferred Circuits Collection,
and I didn't receive any complaints so far.)

JH.