Get and Set audio inputs in an audio application

HI there! I use a an AUDIOBOX USB 1818VSL that has 8 inputs and 8 outputs.
I need to choose from a drop down menu the input (stereo pair) and the outputes (stereo pair) in my AudioApplication. How can I do it?

AFAIK you will have to roll your own GUI, as there are too many versions on how you want to provide that to your user.
To map the channels dynamically you could use the ChannelRemappingAudioSource
As the AudioAppComponent inherits AudioSource, you can set the component as source for the ChannelRemappingAudioSource and pull the samples from that (like you did in the example from the AudioTransportSource).