In order to play org files with this program, "orgplay",
you need to have the following files in a directory called "data":

	fx96.pxt
	fx97.pxt
	fx98.pxt
	fx99.pxt
	fx9a.pxt
	fx9b.pxt
	wavetable.dat

You can acquire these files by extracting them
directly from the Cave Story EXE file (Doukutsu.exe).
You can use the Doukutsu.exe from dou_1006.zip , preferably
original (but these also work with the English translation).
The following instructions guide you to extracting the files:

The wavetable file:

  dd if=Doukutsu.exe bs=4 skip=278937 count=6400 of=wavetable.dat

Or, with a PHP script:

  <?php
  $exe = file_get_contents('Doukutsu.exe');
  file_put_contents('wavetable.dat', substr($exe, 1115748, 25600)));
  ?>

The process of extracting the PXT samples manually is more complicated.
You can use the following PHP script to read them from your Doukutsu.exe.
Just execute it, as:  php dou.php

  <?php
  $exe = file_get_contents('Doukutsu.exe');
  $data   = 0x400000;
  $offset = 0x4115ff - $data;

  function b($s=1)
  {
    global $exe, $offset;
    $result = unpack(substr('CVd', $s>>2, 1), substr($exe, $offset, 8));
    $offset += $s;
    return $result[1];
  }

  $config = Array();
  while(count($config) < 128)
  {
    $c = b();
    if($c == 0x8B) break;
    if($c == 0x6A || $c == 0x68)
    {
      $id = b($c==0x68 ? 4 : 1);
      ++$offset; $chan = b(1);
      ++$offset; $offs = b(4) - $data;
      $offset += 5+9;
      $config[$id] = Array('chan' => $chan, 'offset' => $offs);
    }
  }
  $fields = explode('/',
      'use/size/'.
      'main_model/main_freq/main_top/main_offset/'.
      'pitch_model/pitch_freq/pitch_top/pitch_offset/'.
      'volume_model/volume_freq/volume_top/volume_offset/'.
      'initialY/ax/ay/bx/by/cx/cy');
  foreach($config as $id => $data)
  {
    extract($data);
    $v = ''; $s = '';
    for($c=0; $c<4; ++$c)
    {
      $sep = "{";
      foreach($fields as $i=>$fname)
      {
        $value = 0;
        $dec = strpos($fname, 'freq') ? 2 : 0;
        if($dec) b(4); // Ignore this zero word of unknown meaning
        if($c < $chan) $value = b($dec ? 8 : 4);
        $wid = 4 + (int)substr('119999999999994444444', $i,1);
        $str = sprintf("%.{$dec}f", $value);
        $s .= sprintf("%-{$wid}s:$str\r\n", $fname, $str);
        $v .= $sep . $str;
        $sep = ',';
      }
      $s .= "\r\n";
      $v .= "},\r\n";
      b(4); // Ignore this zero word of unknown meaning as well
    }
    $s .= $v;
    file_put_contents(sprintf('fx%02x.pxt', $id), $s);
  }
?>

You can download the actual songs, ORG files at:
  http://www.cavestory.org/downloads_music.php

Because of license reasons (possibly) I cannot redistribute them here.
(Better safe than sorry.)

Alternatively, you can extract the from your Doukutsu.exe as follows:

  <?php
  $exe = file_get_contents('Doukutsu.exe');
  $pos = strpos($exe, 'Org-02') + 1; // Skip the first match
  $names = explode('/',
    'access/safety/balcony/seal/breakdown/cemetary/theme/tyrant/credits/'.
    'run/fanfare1/fanfare3/fanfare2/fireeye/gameover/balrog/geothermal/'.
    'gravity/hell/oppression/jenka1/jenka2/pulse/lastbattle/charge/'.
    'lastcave/waterway/labyrinth/meltdown2/town/oside/plant/quiet/'.
    'heroend/toroko/gestation/scorching/egg/bushlands/white/blank/zombie');
  foreach($names as $name)
  {
    // Find the next org file within the exe.
    $pos  = strpos($exe, 'Org-02', $pos);
    // Slightly inaccurate but simple method of finding song's length.
    $next = strpos($exe, 'Org-02', $pos+1);
    $song = substr($exe, $pos, $next ? $next-$pos : 9999);
    // Parse the song header to find its real length. This just reduces
    // a few bytes from the file's end. Not absolutely necessary.
    $real_song_length = 18;
    for($c=0; $c<16; ++$c)
    {
      $tmp = unpack('v', substr($song, 18 + $c * 6 + 4, 2));
      $n_events = $tmp[1];
      $real_song_length += 6 + $n_events * 8;
    }
    file_put_contents("{$name}.org", substr($song, 0, $real_song_length));
    $pos = $next;
  }
?>

--- 
Written by Joel Yliluoma in November 23, 2011

Cave Story is a freeware game copyright Pixel Studios.