Now I understand what you meant, thanks. I can connect both lines. Just by inclining the mind towards it, anytime, a coolness flows from the crown to the third eye. If relaxed enough, the front line goes down to the diaphragm or the dantien. But never thought that the energy flowing up and down the back and front line would be strong enough to keep me still and relaxed in a good block-free posture. I just need more practice. Thanks again.
Mario, regarding general throat blockages, from the East you have many Taoist's "six healing sounds" videos (can't recommend any), and from the West I've heard good reviews of Per Bristow's
Voice Method. He does a deep work on relaxing all the muscles in the zone. All in all, a few classes of voice projection/placement (impostar la voz) should give you enough data to enable anyone to work on its own.