If you are talking about the effect at 1:36, its all of the synths, including the lead, chords, and the bass, put through a low pass filter and then I automate the filter quickly from 100% to 0% over and over.
Very nice clean track, Intro is so emotional and I like it reminds me of old Seven Lions song my advice here is to lessen your kicks in the drop because sidechaining ruins some parts of the drop anyways awesome track keep it up :>
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