I found this patch at http://www.alsa-project.org/~james/alsa-driver/audigy2/audigy2_value-support.diff and modified it to apply cleanly to vanilla-sources-2.6.10 and to gentoo-dev-sources-2.6.10-r5. Now my Audigy2 Value works.
Created attachment 48834 [details, diff] Audigy2 Value support for emu10k1 driver
alsa-driver-1.0.9_rc2 has this support (and maybe older ones).