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Install FreeBSD (make sure you install the kernel source code).

Log in as root.

Build a new kernel with sound support, install it, and reboot to load it.

cd /usr/src/sys/i386/conf
cp -p -i GENERIC MYKERNEL
echo device pcm >>MYKERNEL
config MYKERNEL
cd ../../compile/MYKERNEL
make
make install
reboot

Install psmisc from ports (optional).

cd /usr/ports/sysutils/psmisc
make install clean

Install daemontools from ports.

cd /usr/ports/sysutils/daemontools
make install clean

Arrange for svscan to start automatically on reboot.

mkdir /service /var/service
cat <<'EOF' >/usr/local/etc/rc.d/000.svscan.sh
#!/bin/sh
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin
case "$1" in
start)
  exec env - PATH="$PATH" \
  svscan /service 2>/dev/null >/dev/null &
  ;;
stop)
  killall svscan
  cd /service
  svc -dx *
  svc -dx */log
  ;;
esac
EOF
chmod +x /usr/local/etc/rc.d/000.svscan.sh

Start svscan by rebooting, or by doing this:

/usr/local/etc/rc.d/000.svscan.sh start

Install ucspi-tcp from ports.

cd /usr/ports/sysutils/ucspi-tcp && make install clean

Install lame from ports.

cd /usr/ports/audio/lame && make install clean

Install dsprec and mp3cat.

cd /usr/local/src
fetch http://tomclegg.net/software/dsprec-0.2.tar.gz
tar xzf dsprec-0.2.tar.gz
cd dsprec-0.2
make
make install

cd /usr/local/src
fetch http://tomclegg.net/software/mp3cat-0.4.tar.gz
tar xzf mp3cat-0.4.tar.gz
cd mp3cat-0.4
make
make install

Set up a logging service. Raw audio is read from /dev/dsp. 32 kbps MP3 files are stored in /var/log/mp3log/. A separate cleaning service in /var/service/mp3log-clean/ removes old MP3 files.

cd /var/service
pw useradd mp3log -d /nonexistent -s /usr/bin/true
pw useradd mp3logl -d /nonexistent -s /usr/bin/true
mp3log-conf mp3log mp3logl /var/service/mp3log /var/log/mp3log /dev/dsp 32

Start the MP3 logging and cleaning services.

chown root:mp3log /dev/dsp
chmod 660 /dev/dsp
ln -s /var/service/mp3log /service/
ln -s /var/service/mp3log-clean /service/

Optional: set up an MP3 streaming service.

cd /var/service
pw useradd mp3stream -d /nonexistent -s /usr/bin/true
pw useradd mp3streaml -d /nonexistent -s /usr/bin/true
mp3stream-conf mp3stream mp3streaml /var/service/mp3stream /var/log/mp3log YOUR.IP.ADDR.HERE

Start the MP3 stream service.

ln -s /var/service/mp3stream /service/

Wait 5 seconds for svscan to notice the mp3stream service. If you installed psmisc then pstree -u should show something like this:

     |-svscan-+-supervise---multilog(mp3streaml)
     |        |-supervise---tcpserver(mp3stream)
     |        |-supervise---sh(mp3log)---sleep
     |        |-supervise---multilog(mp3logl)
     |        `-supervise---sh(mp3log)-+-dsprec
     |                                 |-lame
     |                                 `-mp3cat

Listen to the stream by opening http://YOUR.IP.ADDR.HERE/ in your sound player program (mpg123, Winamp, Sonique, etc.)

uname -a | mail -s 'my logger works!' tom@tomclegg.net