I had started/posted this in response to your comment that the 12-bit DAC night not work.
When I was looking for a drop-in replacement, I had asked about this,...but you werent sure or replied 'no clue' or something similar.
I had read something about the WaveHC lib that the the last? 4 bits were ignored.. but wasnt sure if this means I could still use the same DAC I have in use.
So to be clear (so "I'm" clear..haha)... my current DAC is not a problem,,correct?
If yes..Im glad/happy then...one more thing checked off the list. 
I still havent been able to get any noise from the speaker/dac using that sample code..
(editing the values and/or removing the delays too!)
thanks