stereo audio from aic33 (ASP help)

I'm having trouble getting stereo data from the AIC33 - well to be more correct, the codec seems to be supplying stereo data, but the ASP seems to be generating mono audio.  And just to top it off, it looks like the channel that is active seems to swap randomly.

MVL 2.6.10 - custom hardware (using ASP0 not 1)

Here is what I've seen so far:

    The ASP setup seems to be looking for two phases of data per frame - but the bit that enables phases wasn't set. Setting this didn't help.
    The second channel of audio is generally midline (0).
    DMA seems to be setup to grab a 32bit word from the interface (DRR register for received data)
    With the codec in master mode I've observed on the scope that there is truly stereo data being fed to the AIC33
    The encoder demo uses a nice averaging trick that hides the channel swap beautifully.

I'm unsure of the logic the ASP uses to determine when to tell the DMA engine it is ready with data. I also don't know what happens with more than one "phase" of data. Are there two DMA transfers or one packed 32 bit word?

Any help from some ASP experts would be appreciated.

Thanks,

    Steve Berry