Thanks for doing some digging for me, I'd appreciate it. If the devs added an option in the app to allow more control over what is recorded from the USB output on the FX that would be great. They have the "advanced routing" option in the Android application, this would be the ideal location for such an option.
Is there a general place to submit bugs in the Android app? I've had a few force crashes over the last few weeks and I leave reviews for the app on Google Play, but I'm not sure if the devs read these review comments.
Your option for compiling with ASIO would work, but I prefer to hear the backing track and guitar through headphones plugged into the FX100, for convenience reasons.
All said, I love the FX100. Thank you.