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.


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.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .