YouTube Uploaded by songofwhales on Aug 11, 2011
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"It has been modified to include poly modulation, a feature sorely lacking from the OB-8."
PolyMod Info
"All you need to get the desired effect in the OB-8 is an additional signal path from the VCO2 saw to the filter control node. The OB-8, as well as many other synthesizers, has an opamp that provides a virtual GND summing node for adding separate filter control voltages. For a first test, I connected the saw output of VCO2's CEM3340 with this summing node over a resistor in the 100kOhm range..."
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