(info "(grub) play")
has no examples of GRUB_INIT_TUNE.
https://askubuntu.com/questions/76309/play-a-sound-before-or-after-grub-loads
has some. Like
GRUB_INIT_TUNE="2000 400 4 0 1 500 4 0 1 600 4 0 1 800 6"
So please add some. Thanks.
Also the paragraph
If the argument is a file name (*note File name syntax::), play the
tune recorded in it. The file format is first the tempo as an
unsigned 32bit little-endian number, then pairs of unsigned 16bit
little-endian numbers for pitch and duration pairs.
needs even an example (file) even more.
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