@Eva Lindqvist thank you for your reply, it means a lot to me. To be true, coming from classical polyphonic choirs, I tend to use my head voice also in lower notes, with the result that they are sort of not quite strong, let's say feeble. On the opposite, modern repertoire perhaps pushes the chest voice higher, which makes me not much at ease. It is quite difficult to find the correct balance. Anyway, the most important thing is this whole process, is that my teacher insists on letting me use the abdominal muscles in a way that perhaps, despite my long choral practice, was not so much emphsized. And, at 68, let's say that I am exploring new possibilities and become a little bit more aware. Better late than never!!