Feature Request (iOS): Ability to set input gain

[paulreimer]

My use case is in handling possibly too-hot input signals when using an iPhone.

The input mixer only appears to set a volume (post-processing); it would be better if there were an additional slider which could set the hardware input gain (or if the input mixer on iOS used input gain if it is available) -- this could avoid distortion, which software volume cannot resolve. I believe this is doable via JUCE's iOSAudioIODevice::setInputGain.