That working...
That worked fine. Now that the shipping rules on reference the items where shippable is = 1 the digital goods in cart work fine. But, I have one other question. I want to write two coupons. One, Buy 4 audio files get the 5th free, and two, buy five cards and get the 6th free. The card is a shippable item while the audio file is not. So, I'm assuming you could reference the shippable field again to apply the coupon, but I'm not sure. I just need a shove in the right direction. What would be the best way to accomplish this?