[plt-scheme] support for sound or interfaces to sound software

> > permissions on the Macintosh.  One of the simplest is to set up a
> > root account (I mean one where you can graphically log in) and then
> > run DrScheme from that account.  That way you don't have to change
> > any of the permissions.
> 
> Using the machine is very bad in terms of security.  Definitely not a
> good way to solve this.

I should have clarified: I meant to say you should run DrScheme ONCE from
a graphical root account in order to download the rest of the
documentation.  Of course there is no reason after that to run DrScheme
from the root account.