iOS 11 Screen Recording - Live In Game Commentary Woes

I was super excited to see that the iOS 11 version contains the screen recording feature. I had been contemplating getting an El Gato unit to record my test server analysis.

I have been experimenting with the screen recording feature and it all looks great. I have gotten every bug resolved, but one.

Recording live commentary.

When I play the game and record live commentary, in the heat of the battle, the game sounds conflict with my voice recording. I simply get over run by the in game sounds.

I know. I know. I can turn off the game sounds, but what if there is an issue with the sounds that I would like to report to the dev team?

I found that I can record game action and sounds, then through iMovie I can reduce the recording's volume and I can add my commentary post recording.

Has anyone found a way to record live commentary without having their voice drowned out by the game sounds?

I have tried starting the recording on the home screen and then launching War Robots. That seems to help a bit, but then I'm stuck recording in portrait mode.

Suggestions?

I have an iPhone 7.