Great!
First thing will be the source selection. Besides, I believe there still are some issues left. I have to adjust the device discovery a little bit to filter out some non Pioneer devices. And read some problems with volume Scaling.
Do you have this volume problem as well? With normal settings the slider should range -80.0 dB to -25.0dB. My maximum level is +12.0dB, which is possible with the app by changing the setting.
There are a few options left that can be integrated into the app if enough interest. I Will post a list with options after the source selection is integrated to check the interests.