sysctl.conf settings not loading on boot

[Kuboaa]

Hello all

Recently installed FreeBSD 8.0 for the first time on my Toshiba Satellite A215 laptop. Everything seems to work fine except I need to run

#sysctl hw.snd.default_unit=1

to get my sound to come out of the headphones. I'd like to set that as the default, but it resets back to 0 when I reboot. Since this is a laptop, I end up shutting down fairly often and don't want to change it manually every time. I tried adding

hw.snd.default_unit=1

to /etc/sysctl.conf but when I reboot, sysctl still resets to 0. Am I going about this the right way? I'm not sure why it won't load the new configuration on startup. Please let me know if any additional information would help.
Thanks