I've checked on Holtek fairly recently. They're a Taiwanese company,
with only one sales office in San Francisco. They don't want to talk to
you unless you're interested in 100K unit purchases or more.

Information Storage Devices in San Jose (408) 369-2400 sells a line of
voice recorder chips in various sizes. They use a variation on the Flash
EEPROM technology, storing analog levels instead of simple digital values.
They're not terribly expensive, and they're available in small volume
through distribution.

There's also a source of the old SP0256 speech phoneme synthesizer chip....
BG Micro in Dallas, TX. They've got some old surplus stock, available for
$4.95. (800) 276-2206 or (214) 271-5546 for orders, (214) 271-2462 fax,
(214) 271-9834 tech support. bgmicro@ix.netcom.com

Mark G. Forbes, R & D Engineer  |  Acres Gaming, Inc.    (541) 753-0553 x324
KC7LZD                          |  815 NW 9th Street     (541) 753-7524 fax
forbesm@peak.org                |  Corvallis, OR 97330
http://www.peak.org/~forbesm