I think there were several versions of the 3372, so if you are buying, you may want to see what you have and try to match it.
The Akai AX80 had three different versions of the OS, to match three versions of the 3372.

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On Mon, 11/14/16, hdk2000hdk@... [chromapolaris] <chromapolaris@yahoogroups.com> wrote:

Subject: [chromapolaris] CEM chips
To: chromapolaris@yahoogroups.com
Date: Monday, November 14, 2016, 7:03 PM






























I though I only had 3 or 4 good channels (I have 5!), so I
recently received quotes for CEM chips from icelect.com. I
only found them through searches via Google... so I
can't vouch for their quality, etc. The '72 price
looks reasonable, though.
Part:CEM3374 
Qty: 6 Min - Price: $ 72.00 each 
Mfg: CEM - Description: ELECTRONIC COMPONENT : DUAL VOLTAGE
CONTROLLED OSCILLATOR. 18 PINS : DIP-18 PACKAGE

Part:CEM3372 
Qty: 10 Min - Price: $ 15.00 each 
Mfg: CURTIS - Description: ELECTRONIC COMPONENT : SIGNAL PROCESSOR
: 18 PINS : DIP-18 PACKAVE