Brahms Op.117#2 - Olympus OM-D E-M1

Most simple set up the Olympus Camera and external electret condenser microphones, so post-processing whatsoever. Capsules of the microphone are 1,50m apart and about the same distance to the piano. On the camera, under Movie settings - one needs to enable Plug-In Power and (counterintuitively) set "Camera Rec. Volume" to "Inoperative.
That way the condenser microphone bypass all audio processing and the signal is directly recorded in uncompressen and unprocessed 16Bit 48kHz Stereo.

[@arnauldbordes]

Merci.