Configuration Through DBus
First fire up the FFADO DBus server:
This will discover the devices on the bus, and will expose their control feature through DBus. It survives a bus-reset, so as long as you keep the devices connected there is no need to restart it.
Now that the configuration space is exposed, you can explore it through tools like dbus-viewer or qdbusviewer.
Once the FFADO DBus server is active, you can also start the python based mixer in support/mixer/ or support/mixer-qt4/ as ./ffadomixer. This will check whether a mixer GUI is available for your device and will fire it up if there is.