Automatic Rendering is done by the chosen DXi synth and to my knowledge will always have to use the sounds within that one DXi synth. Never tried it with Virtual MIDI Cable softwares or the like, but I doubt that can do the job anyway.

Your best bet would be to Record the output of your soundcard to Line Input, or if your card supports it, via recording the Direct Out Monitoring, sometimes called "What U Hear" or "Stereo Mix" or "Stereo Wav" from beginning to end of playback, onto an Audio track. Just as when using hardware MIDI synths.

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You must be Audiominds.