update gutenbach url

diff --git a/doc/using-gutenbach.mdwn b/doc/using-gutenbach.mdwn
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--- a/doc/using-gutenbach.mdwn
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-[Gutenbach](http://github.com/jhamrick/gutenbach) is the software that powers sipbmp3, the system for playing music in the SIPB office. Installing it and configuring it is simple: 
+[Gutenbach](http://gutenbach.mit.edu/) is the software that powers sipbmp3, the system for playing music in the SIPB office. Installing it and configuring it is simple: 
 
 1. Download the latest version; if you're on a Debathena machine, you can run `add gutenbach` and be done (you might want to add this line to your `~/.bashrc` or `~/.profile` so you don't have to do it each time. If not, then either `git clone git://github.com/jhamrick/gutenbach.git` into a suitable directory or pick the latest download from [the downloads page](http://github.com/jhamrick/gutenbach/downloads). Then `sudo make install` in the gutenbach/ directory to install the scripts into your `/usr/local/bin` directory.
 2. `gutenbach-client-config -a sipbmp3 -h zsr.mit.edu` to tell gutenbach about the sipbmp3 queue on the machine zsr.mit.edu