The audio and OSC settings of the app can be accessed by touching the top right button of the app:
The settings pannel is still a work in progress and just a few parameters can be configured in it. Currently, audio parameters can't be controlled. The deffault sampling rate is 44100Hz, buffers length is 1024 samples and only the internal audio interface of the Android device can be used.
By touching one of the sliders parameter name, you can access the following control pannel:
It allows to assign one of the accelerometer axis to the selected parameter to control it. Sensibility can be adjusted with a slider and the accelerometer orientation is reversible.
Each slider of the user interface can be controlled via OSC (Open Sound Control). The deffault port is 9001 but it can be modified in the Settings/OSC window. Every parameter has its own address that is based on its name. For example, if the parameter name is "Modulator Frequency" the OSC address will be "/Modulator_Frequency" followed by the desired value: "/Modulator_Frequency 289.5".
Help on Faust: write your question to the Faust mailing list.
Help on faust2android: contact Romain Michon.