The OST version of a dynamic soundtrack is manually arranged by the composer(s) for the track release. 

The dynamic, in-game version is controlled by a variety of parameters in the engine and reacts to gameplay. 

As far as how to compose like this, it's fairly straight forward: 

You wri…

Calling all fellow composers! I am conducting a survey as part of my final year of Music School. If you have a few minutes to spare, please consider filling it out and sharing your valuable insights. Thank you in advance!

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