Thank you, sir :)
Yes, Mortville Manor had voice synth but that sounded very unclear and robotically which made each spoken line quite hard to 'decypher' as player.
The nowadays 'natural voices' synths are pretty cool, but still sound a bit off here and there. So therefor VA would be the best to replace the original voice synth Mortville Manor used.
So, if for some reason I can't find enough voice actors/actresses, I'll stick with text only indeed.
We'll see...