Cubase 5 : Need to Export Midi track via Audio Mixdown (Korg i3)

Hi all

I’m running Cubase 5 on a decent PC.

What I have is Cubase connected to an old Korg i3 synthesizer, I can get midi in and out etc fine. Now when I create an instrument and drag my midi to those tracks and assign a sound, then great, those instrument tracks are exported as part of the audio mixdown.

Unfortunately for me, the sounds I need for my “song” are sounds from within the Korg i3, which I can hear during playback but on export, they’re not included.

Could any kind soul please tell me how I could achieve this ?
If there are videos, screenshots, that would be most helpful.

I’ve tried loads of different things but whatever I do, I can’t seem to get it to work. And after 2 days of trying, it’s rather frustrating. Somebody else out there must have solved this ?

Thanks in advance.