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Perform an operation described by ''Op'', and uses the parameters depending on the operation.
===== Operation list (by [[user:aali|Aali]], amendments by and [[user:DLPB2|DLPB]]) =====
<ul>
<li>'''10''' Play music [param1=Music ID]</li>
<li>'''14''' Same as 10</li>
<li>'''15''' ''Unknown''Serves no significant function</li>
<li>'''18''' Play music and resume from last position [param1=Music ID]</li>
<li>'''19''' Same as 18</li>
----
<li>'''20''' Play a one sound effect [param1=Panning, param2=Effect ID on channel #1]</li>
<li>'''21''' Play two sound effects [param1=Panning, param2=Effect ID on channel #1, param3=Effect ID on channel #2]</li>
<li>'''22''' Play three sound effects [param1=Panning, param2=Effect ID on channel #1, param3=Effect ID on channel #2, param4=Effect ID on channel #3]</li>
<li>'''23''' Play four sound effects [param1=Panning, param2=Effect ID on channel #1, param3=Effect ID on channel #2, param4=Effect ID on channel #3, param5=Effect ID on channel #4]</li>
<li>'''24''' Same as 20</li>
<li>'''25''' Same as 21</li>
<li>'''2A''' Play a sound effect on channel #3 [param1=Panning, param2=Effect ID]</li>
<li>'''2B''' Play a sound effect on channel #4 [param1=Panning, param2=Effect ID]</li>
<li>'''30''' Same as 2B? (may be broken Play a sound effect on PC game)channel #5 with centre panning</li>
----
<li>'''98''' Resumes music and sound effects</li>
<li>'''BD''' Tempo transition for channel #1 to #4 [param1=Transition time, param2=Target tempo]</li>
----
<li>'''C0''' Set music Music volume [param1=Volume level]</li>
<li>'''C1''' Music volume transition [param1=Transition time, param2=Target volume]</li>
<li>'''C2''' Music From-To volume transition [param1=Transition time, param2=Starting volume, param3=Ending volume]</li>
----
<li>'''C8''' Music balance [param1=balance]</li><li>'''C9''' Music balance transition [param1=Transition time, param2=Target balance]</li><li>'''CA''' Music From-To balance transition [param1=Transition time, param2=Starting balance, param3=Ending balance]</li>----<li>'''D0''' Set music Music tempo [param1=Tempo]</li>
<li>'''D1''' Music tempo transition [param1=Transition time, param2=Target tempo]</li>
<li>'''D2''' Music From-To tempo transition [param1=Transition time, param2=Starting tempo, param3=Ending tempo] </li>
----
<li>'''F0''' Stop music</li>
<li>'''F1''' Stop sound effects (this will not affect operation 0x30channel #1 to #4)</li>
</ul>
==== Please Note ====
Channel #5 (used from operation 0x30) is dedicated to the menu and should not be used for anything else.<br>All transitions use the formula Transition_time (in seconds) = param1 / 60.<br>The pan (audio L/R balance) values value range from is 0 to 127, where 0 is fully left, 64 is centre, and 127 is fully right.<br>The maximum game volume is 127.<br>The tempo value ranges from range is 0 to 64 (0x40)127. The normal tempo is 0.<br>Operations 0x10/14/18/19 do not work on the PSX game from field script [CURRENTLY CHECKING THIS].<br>It should also be noted that there is very likely no difference between operations 0x20 to 0x27. They all likely have Operations 0xC8/C9/CA are not implemented in the PSX version or PC version despite the exact same outcome in FF7field script calling them.<br>
