audioDeviceIOCallbackInt - Writable input

Hi, is it possible to get an input to the audioDeviceIOCallbackInt that has a writable version of the inputChannelData argument?

const float* const* inputChannelData would need to be float* const* inputChannelData.

I want my app to be able to affect the audio already being piped to the soundcard by another application. I don’t even know if such a thing is possible.

I’ve tried setting the WASAPIDeviceMode device mode to exclusive, that sounds like it might do something I want, but it always fails to have a valid input.

Edit: another way of me asking this question is “How can I use Juce to take data on it’s way to the soundcard and affect it? e.g. muting all of the left channel?”