Sound sequence
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A sound sequence is a set of sounds played while a sector or polyobject is moving, such as the mechanical noise made by moving floors in Doom. It's identified by a number (the sound sequence id) and defined in EDF using the soundsequence block.
The feature originates from Hexen and is useful for customizing sector sounds, hence the availability in ports like Eternity or ZDoom well before their support for playing Hexen itself. In Hexen the sound sequences are hard-coded.