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Finally, I found this video which explains it very good:

pin 1, 19 filter in, and modify noise circuit indeed:

External Audio passed thru a Korg Poly 800's filter

This is by far easier than building an external filter box.

External Audio passed thru a Korg Poly 800's filter

I used the audio output from a Roland JX-1, tapped it into the NJM2069 Filter IC chip and triggered the JX-1's voice via the Korg's MIDI out.. thus triggeri...

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Korg Poly800/EX800 Users

Re: Ext filter signal?

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