GoForSmoke:
Are you making square waves or reading waveforms?
You talkin' to ME? 
I will assume so...
I would be reading, not writing, if I was looking to pull data off an ADC. I was just using the data the guy posted about square waves being the likely upper limit for reading bits off the GPIO pins as well as writing to them. I am not sure if that is true, but I am going with that for the time being. My Raspberry Pi arrived from Newark today so I will have to get an image ready for it and see what it can really do.