This might seem a very odd reply, but maybe bare with it.
I transitioned some years back and 'pass' whatever that means; in my case I'm treated just as a normal woman in everyday society and no one seems perturbed by me in any way. I'm certainly not misgendered by anyone.
After work my voice was quite good and certainly didn't raise any eyebrows, after my recent laryngeal cancer treatment my voice is effectively destroyed. I have a hoarse gravel whisper that is by no means feminine, it is clearly audible but in a deep range; my whisper cracks and changes as I 'speak. There is no outward sign that I have had throat cancer and I do not bring the matter up.
I have had absolutely no rejection, comment, blinks misgendering on my 'voice' which is very clearly a 'male gravel whisper' due to the destruction of my vocal cords. Admittedly I and I know many women with cancer, tend to over express our femininity with a pretty scarf or a bright 'thing' (we seem to have a need to make ourselves feel good, with good reason!) but I have made no other changes.
I did ask some of my cisfemale friends what they thought of my voice and their comments were interesting, they were all on clarity and volume; 'Yes you are clearly understandable' 'Oh your volume isn't great but anyone can understand what you are saying' etc. None of them commented on any masculine component - and they would have, as they have no hesitation in being honest with me; they are my friends.
I'm lead to believe that transpeople become our worst enemies, we see and hear our flaws and magnify them out of all proportion. In every day people just don't see or hear - or maybe don't associate it with being trans. After all how many transpeople do most people meet every day?