I don't know why I keep writing to Orchestral Tools to ask about the accessibility of SinePlayer. Their latest response makes it fairly clear that blind musicians are simply not an audience they are interested in. Their latest response:
Hi Guillem,
I am afraid the situation remains the same.
We are aware SINE is not very accesible and there are blind people using it with varying levels of success.
Unfortunately, while we do not hinder accessibility tools on purpose, I am afraid our current priority is SINE development on bugfixing and the most recent OS.
While we want to improve SINE as much as possible, I am afraid we do not have the manpower to be able to implement all possible requested features.
Apologies for the bad news. Anything else, just let me know.