I've been training with the foundation building routine religiously for the past week and I'm phonating really great sirens with Embuchore and larynx dampening. But during the sirens there seems to be two routes my voice can take as it rises in frequency. One route is into an airy falsetto, the other is a more stable chesty/twangy sound that I'm now able to carry up to b#4. My question is which route do I take? Am I pulling chest? Is that bad?