There was one BBS back around 1984 out of Florida that utilized the full features of the TE2 cartridge. It played music, graphics, and speech. As a college student, I sent the guy that had developed it something like $60 or $80 for the software and got ripped off as he never sent me anything in return. I've got his name written down somewhere. Somewhere in the 90's, I think I recall seeing the guy had a number of legal issues. I was pretty bummed out as that was a LOT for me at the time.
I do know, though I do not know if it works, Tim's ANSI interpreter code has something with music capability as it was part of the ANSI standard. I saw some information out there suggesting the ANSI music code sequence conflicted with another ANSI sequence. To date, I do not think I have ever seen a BBS with ANSI music.
As far as speech for the TI, one would need to be able to run an assembly language coded emulator, while having the TE2 cartridge plugged in. The TIPI would allow something like that to load from Basic. The use of the TE2 emulator software kills its use if you want ANSI or 80 column capability. If you are really trying to use speech for what comes across the screen, you would really be limited to 300, maybe 1200 baud on any emulator. To me, that would be unbearable. For a blind person, not so. Hopefully, no members here are going blind.