I'm having that same problem but using Solaris. No one can give me an answer to the problem. No matter what I do, the driver always ignores sblive.conf's settings. My card is a standard audigy with the digital inputs and outs but not the external box that came with the premium version. Soundoff/soundon, ossdetect, reboot, nothing works. There's one other person in the Solaris forum group that had the same problem but no one ever answered him adequately either.
So... either 4front doesn't know what the problem is, or we're being ignored. Sound works fine in analog mode with windows (2k or XP), Alsa, and the normal FreeBSD drivers, but it's stuck in digital only with opensound v. 4 (tried both 1006 and 1007). I seem to remember this working just fine a long time ago with version 3.7 (or was it 3.9?). So there is a change in v. 4 that has things messed up from what i can tell.