Korg CX-3 parts

[Sebastian Teir]

Where can I find a SM304 chip for my Korg CX-3 in Europe? Does anybody know what it does, could it be omitted?
    
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+------------------+    §ebastian Teir          jteir at cc.hut.fi
|    |< £ ]3 U     |    JMT 7C 382              0400-597 355
+------------------+    02150 Espoo             09-468 2860
+   |###|##|###|##|+    Finland                 http://www.hut.fi/~jteir
+_ at _|||||||||||||||+