[gaudat]

Back when I was a kid I played with some of those black MIDI files. I think one of the tricks is to put the same melody on multiple octaves. It makes the sound fuller without going dissonant.

There is also a phase like effect that can be done by playing sgales really quickly. I think I saw that in one of the original Touhou black midi files.

And of course there is pressng all 88 keys on the MIDI piano at the same time. I would like to know what that sounds like on a real piano though.

I think black MIDI starts as a rendering artifact in a Japanese music notation software. The name was "Frieve" or something. It renders as many notes put in a measure. Without expanding the view. That is sort of what's going on in the Wikipedia pic.

[bskrobisz]

>And of course there is pressng all 88 keys on the MIDI piano at the same time. I would like to know what that sounds like on a real piano though.

The mute pedal on an upright/console piano works by situating the hammers closer to the strings; if you stomp on it hard enough, you can get it to jerk all of the hammers such that they actually hit the strings and get this "all 88 keys" noise. I don't recommend this if you care for the piano, though :)

(On a grand piano, IIRC the mute pedal instead either adjusts the position of the hammer to only hit 1-2 of the strings, instead of all 3, or it moves the felts to dampen the sound).

[cwillu]

Hold the sustain pedal and then drop the lid “by accident”.

[gaudat]

Tried it as a kid. The score stand only hit the middle half of the keys though :)

[jacquesm]

That would sound like a very quick glissando.