The news here is that I'll have my follow-up at Charite on Oct 16. In the meantime, I've sung in jazz bands without ill effect and I've also led synagogue services without problem as an alto. The follow-up will reveal how good the surgery actually was.
However, my endurance still isn't near pre-op levels. My singing voice still tires quickly, although this has gotten better recently. I don't regret any of it, since my speaking voice is just so much better. I'll keep you posted of further developments.
Kind regards,
Amy