The synthesizer connection structure describes how a MIDI device is connected to the computer. It is defined by the SynthesizerConnections data type.
struct SynthesizerConnections {
OSType clientID;
OSType inputPortID;
OSType outputPortID;
long midiChannel;
long flags;
long unique;
long reserved1;
long reserved2;
};
typedef struct SynthesizerConnections SynthesizerConnections;