How is this recorded? / Find the mistake

[Bob]

https://www.ebaumsworld.com/video/watch/82236708/

It's a wind-powered toy piano.  Analog sound I would think.  How does he record that without getting the finger slap and keyboard keys moving sounds?  If that black thing on the left is a mic... But why no extra sounds? I wonder if it's fake.  At 5:30 he's doing some fading though so there might be a mic on the left.

And play "find the error" in this video.  I didn't catch it until 2:30 but I knew something was off.  I thought he was left-handed.

Ah.  A breath sound at the end.  How does the keyboard and fingers not make any extra sound though?  I wonder how much it's edited.

Not that it matters so much.   

[littletune]

Oh you mean that it looks like the high notes are on the left side and low ones on the right? 

[Bob]

I don't think it's just the keyboard.

[littletune]

Oh then what else? you mean the whole picture? or video?

[quantum]

It appears the video is mirrored.  It is possible to filter out noise in post process.  One could theoretically create a noise profile of finger slaps and filter it out.  The volume level and balance of the rhythm track could also help to obscure noise.  

The fading thing sounded like it had too even a gradient to be done by the movement alone.  It appears he keeps the instrument relatively on axis to the mic throughout the fade.  There may a little fall-off from increasing the distance, but not as much as is presented.  If you consider other parts of the video, he does move around.  Would not these result in detectable changes in amplitude as well?

There may also be some beat quantization going on.  The attacks and sync with the rhythm track sounded a little too accurate and consistent.  

[quantum]

Went to look up more on this instrument, and randomly came across this:

[Bob]

So maybe just quiet keys.  And the fade is done with breath. I was wondering if the sound was all digital, ie fake.  I'm still leaning toward real though.

And yes, for the whole image being mirrored.  

It's a pianica or melodica.
https://en.wikipedia.org/wiki/Melodica


Here's another video.  Why is that... Joshua Bell?  Busking on a street corner?  Is that video where no one realizes it's a world-famous musician and everyone walks by and ignores him?  Thanks to Youtube we can all appreciate... Ouch, that lady... Several people "waddling" by, except for the jogger.  Haha.  Unfortunately the world can only support just so many people doing this kind of enough.  Even if we go to the best music schools and practice forever, nearly all of us will never be able to achieve anything near this.

You can hear the keys on this one.

Sounds like a loud instrument too.  I wonder if that original video was just loud, loud enough to cover up any key slapping noises.