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but why not just record audio the whole time in between takes?

You're completely missing the point AnotherDave. Since the raw function doesn't record audio, the idea is to simplify the editing process by having the exact portion of audio for each video file, and avoid the waste of time that implies syncing and cutting audio.

That's beautiful, Markus! thanks for the video!

Correct me if I'm wrong, but I've just thought of a huge disadvantage of this method. While recording you can't monitor the audio mix since the continous tone would drive anyone nuts.
Unless there is a function in the recorder to monitor each channel individually. I haven't bought my zoom H6 yet but it would be wise to make test before writing the code.

Are you sure? Does h4n has the same feature as h6 regarding beep start/stop ?

From the zoom h4n webpage:

"You can set your H4n to automatically record whenever sound above your designated level is detected. This ensures that you capture everything of importance while minimizing blank sections such as when recording a conference or lecture."

http://www.zoom.co.jp/img/products_img_en/h4n/h4n_11.jpg

That's great Markus!
But it gets even better. The zoom H6 also has an Autorecord Stop function, too. When turned ON, as soon as incoming signal drops below the Stop Level you've set, recording ends (page 85 of the Zoom H6 manual).
So if the camera sends a continuous tone whenever it is recording, both the camera and the recorder are always in sync.
The tone coming out of the camera can even be on just one channel in order to save battery life.

It shouldn't be difficult to develop this function in ML.

Its not perfect because you still have to stop the recording after you stop the camera and at the same time press record so its listening for the next start beep.