@ikoz said in adjustable playback speed:

t should be relatively easy with a script using ffmpeg, either in Libertine or bundled in an app.
The following command should work:

ffmpeg -i input.mp3 -filter:a "atempo=1.5" output.mp3

Thanks you so much! It worked!

For anyone interested. I first installed ffmeg in the Libertine client. Looked for the mp3 file in the folder and used the following script to run the script in the libertine container:
libertine-lauch -i CONTAINER-IDENTIFIER ffmpeg -i input.mp3 -filter:a "atempo=1.5" output.mp3

Really nice! And because of this I begin slowly exploring the power of Libertine!