Hi. Very helpful thread. I have a Roland Duo-Capture EX which connects to the Sansung S8 OTG USB3 adaptor and gives a USB 'green light' (it's running on its own battery power, not drawing from the phone USB) but I can't find any settings on the phone that will allow it to be recognised as an audio source. I have tried the developer option usb as audio source, but nothing. I'm using the Cinema FV-5 app which defaults to the phone mic, despite being set to external mic. From the other responses, looks like this isn't going to work, owing to S8 USB audio issues.