Sometimes when I sing really 'heavy stuff', I notice a slight soreness on the chords. It is nothing close to becoming hoarse, I just feel that I have used the chords, like when I was a kid and had cried, and were left with this subtle sensation afterwards. It disappears after a short while, and the voice is not affected. It is strong and clean and I can sing for long time. Is this normal, or are we supposed to feel nothing when we sing, should our chords be like 'baby skin', if you know what I mean?