If you're using an MME audio driver, then you can keep "Use VST/DXi Synth" checked. MIDI Thru (what you hear when you play on the keyboard) will still play through the MIDI Output Driver. So it should just work as long as the GS Wavetable is selected for Output.

If you'd like to use an ASIO driver to bring down the latency (highly recommended), and your sound card or audio interface didn't come with its own ASIO driver, then you should be able to use ASIO4ALL. It can be downloaded for free from www.asio4all.com. When using an ASIO driver, MIDI Thru will play through the default DXi/VSTi synth, just like the other MIDI tracks.


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