What kind of voice recorder are you using? Just curious.
Nothing at all wrong with cheap, I would say most of us here do not have a vast budget.
Actually for a digital camera I'm using a webcam that I converted to an IR camera. Works great. Am currently in the process of converting a cheap keychain camera into a IR DVR.
As for the light, yes I know many investigators use a flashlight with the cap partially unscrewed to see if an entity can turn it off and on. I'm not sure how the morse code thing would work, unless you're communicating with someone who was a WWII vet, or amateur radio operator.
Wow, GO camera. Those are not cheap. I think I would probably investing a multi-input DVR first. And a string of IR cameras. To help cover multiple angles.