[BRLTTY] Explicit toggle change

[Stéphane Doyon]

On Sat, 26 Oct 2013, Dave Mielke wrote:

> The end note of each indicator is different, so, to make it work right, we'd
> need to create "already there" tunes for at least six cases (three pairs):
> on/off, link/unlink, freeze/unfreeze.

I had somehow forgotten that link/unlink was different. (That's silly 
since I hear it all the time.)
I had figured for freeze we could try playing the same two notes from the 
end of the toggle sound, but it might not sound right at all, haven't 
tried.

> We could, of course, make the tune system
> cleverer so that it could extend the tune itself. That's why I figured that
> simply playing the tune twice might be adequate.

Let's try it and see. I like that it's simple.