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my $h = unpack2hash(
  [
...
  'l3:@unk4',
  'l4:@notepos'
  ], $data);

my $h = unpack2hash(
  [
    [ qw(l $ songid) ],
    [ qw(c8 @ signature) ],
    #...

my $h = unpack2hash( $data,
    'l:$songid',
    'c8:@signature',
    #...
);