Use your external audio interfaces and microphones with Tape It. It's literally as simple as just plugging them in.
When your external microphone is used, Tape It displays its name right on the record screen. You can choose input channels in the audio settings. To switch back to the internal mics, just unplug it.
This makes Tape It an ideal app for field recordings - even more so as you can save your recordings in lossless audio quality.
But it's even more useful: the next time your studio engineer asks you to re-record a bassline, you don't need to get your laptop out. Just plug your audio interface directly into your phone and record it here.