Try turning igain up:
$ mixer igain 75
If that doesn't help, I would suspect that your AC'97 codec is not supported since you are getting "primary codec not ready" messages. Do you know which AC'97 codec you have?
In the case it's not supported, I would try using the OSS drivers instead. They tend to support a wider range of hardware. The only downside about them is that they don't allocate virtual channels automatically. Be sure to unload the FreeBSD driver (and preferably reboot) before trying to use them though.
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