The timecode is Audio based, so it is prerecorded either on CD'd or in this case above probably just a soundfile on a USB-stick.
If you should manage with mono audio, you can have sound on one channel and timecode on the other, just make sure you dont play timecode to the audience
- This approach I have used several times to sync fireworks (pyrotechnics - not the software) to music.
But since I have not seen any addon boxes for this purpose, my guess is input through a soundcard?
I hope someone can confirm or correct this.