analog storage sequencers

[WeAreAs1 at aol.com]

Regarding "analog EEPROMs", Brad Sanders wrote:

<< Yeppers. These are also the heart of those talking birthday cards. I think
radio shack also sells a $20 pocket size "voice memo" recorder - maybe take
one of these and stick it in a panel with buttons and jacks... >>

I was just checking out Rohm Electronics' website ( http://www.rohm.co.jp ),
and I found this little reference:

EEROM Applied Products 
Memory for personal computers 
Non-volatile electronic potentiometers

Unfortunately, there was no further info to be found about these curious
"Non-volatile electronic potentiometers".  I am assuming that these parts are
similar to what is being used in the Radio Shack toy, correct?  Does anyone
know where further specs can be obtained?

Mike B.