Same problem here, sort of. NOT using VoodooAudio however, and not using SleepEnabler.
What I did was get sleep to work pretty much 100% via DSDT, so eg: fans off and wakeup from keyboard is working.
Before fixing sleep, I had audio both digital and analogue; using DSDT (slightly modified from what's in the package, but that's not really relevant), LegacyHDA (5/09 version), and 10.6.1 HDA chucked into /S/L/E.
After fixing sleep, I get no audio on power-up. Well, no analogue. TOSLINK out works, didn't test SPDIF in yet.
I DO get full audio (analogue+digital) after sleeping and resuming. A few pops on analogue startup.
I've tried a few things (add PIN config in DSDT, but no impact; seems like mixer/preamp paths or audio PA is not getting enabled at boot as I also get pops on analogue audio start even when it is working) but so far no luck.
So I am wondering:
a) swedish meatball - does your audio work after a sleep??
b) does anyone know a fix for the problem?
c) or is no-one else having this problem?
Figure that the underlying issue may be the same, else I'd happily start a new thread on this specific issue.