I've got a cell phone, gopro, and DSLR that I want to record audio into. I don't want to record audio into a separate device.
The problem with analog mic-level (millivolt) signals is that they require amplification inside the recording device before being converted to digital and recorded. The preamp inside the aforementioned devices are all very noisy and all introduce a background hiss into the audio (not difficult when the mic input signals are in the millivolts).
I have a device that can take a microphone and output clean line-level signals of what the mic picks up.
I can rewire an AUX cable so that the mic contacts on the plug output line-level signals from the device above, which means the mic input on the camera would receive line-level signals from the AUX cable.
Would this allow me to then set the camera's internal microphone gain to zero, thus utilizing the noisy preamp to a lesser degree, and result in a cleaner recorded audio? Or do I have a high risk of overloading and damaging the circuitry of the camera?