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midiConnect (winmm)
Connects a MIDI input device to a MIDI thru or output device, or connects a MIDI thru device to a MIDI output device.

C# Signature:

static extern UInt32 midiConnect(IntPtr hMidi, IntPtr hMidiOut, IntPtr pReserved);

VB Signature:

Declare Function midiConnect Lib "winmm.dll" (hMidi AS Intptr, hMidiOut AS Intptr, pReserved AS IntPtr) AS UInt32 ' LD83

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Sample Code:

UInt32 Connect(IntPtr midiInputHandle, IntPtr midiOutputHandle)
     return midiConnect(midiInputHandle, midiOutputHandle, IntPtr.Zero);

midiConnect on MSDN

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