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I am looking for an Automator action (or an app with Automator support) that can adjust the volume on audio files (something like set to 150% of input file volume), preferably free.

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How about something like SoX (free/donationware). It's features page lists wide variety of volume/level effects, including:

  • Volume/level effects
    • ...
    • ...
    • vol: Adjust audio volume

According to the SoX documentation, the following should double the volume of input.wav and write it to output.wav (the value after the -v flag is a multiplier)

sox -v 2.0 input.wav output.wav

You should be able to use this in an Automator workflow using the "Run Shell Script" action.

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