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Virtual Workshop Interface->General Purpose Interface Calls->GetWaveForm

extern "C" LONG GetWaveForm(LONG nExtensionState, DWORD nPortAddress, DWORD nCount[32], DWORD* pWaveForm[32])

This is used by variant extensions to provide PWM output.  This output will be received by other extension via the SetWaveForm() call.  See SetWaveForm form more details.