Flutter change audio frequency - flutter

Basically I'm using the plugin sound_stream which it's very nice to record/play or stream the mic audio.
I'm trying to do this stream listen to frequency between 2.35Hz and 2.5Hz.
How it would be possible to archive this?
I learned mainly Java but I'm trying to do both platforms that's why I'm using Flutter. So help/tips are very appreciated.
Thank you!

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I am using just_audio, an amazing Flutter package that helps us working with .mp3 files.
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