<p>lorelei is the expert, so I should probably not post, but the way the notes are produced may change as she learns to negotiate her break in a different way. I lost middle notes, not high notes, as my voice developed, and have had to work on getting them back.</p>
<p>I am also an asthmatic but it has never affected my highest notes, just those slightly lower because the lower notes seem to need more air.</p>