James,

For some reason, tapping the aux voltage dc button does nothing on my iPhone with the app version on there (which is why I was confused that it’d never register any resistance). When I used the testflight version on my iPad, it works fine (but I didn’t have the stock app on the iPad, so I can’t say that the button would or wouldn’t have worked there w/ the app-store version). My iPhone is my ‘production’ iOS device so I don’t want to testflight it, but I’ll uninstall the testflight version on the iPad, reinstall the stock app from the app store, test the channel tap button, and if it works, I’ll uninstall the app store version on the iPhone and try re-installing it. Thanks!