I started on the free version of Jamup, and have gradually expanded it to the full app. I now, as of last night, have all effects and amps available, including the Whammy pedal.
I don't bother with dual amping, because for me the only way I would use it is for distortion, and several of the OD pedals allow a clean/distorted blend. I normally just run a main bass sound, and add effects as needed for each song.
Spent about an hour today practicing with Jamup, and I think I've finally got a AD-200 tone I like.
I personally can't wait for BIAS for iPhone. I have a feeling that the little something I'm missing in my tone will be found by tweaking BIAS.