Convert 48000 to 44100 without change in pitch?

You shouldn't get a change in pitch when you convert properly.

• Select the audio regions pointing to the desired audio file in the Arrange area, then choose +Audio > Convert Regions to New Audio Files+ in the local Arrange area menu (or use the +Convert Regions to New Audio Files+ key command; default: Option-Command-F).

The part of the audio file spanned by the audio region is converted to a new audio file.

• Select the audio files in the Audio Bin, then choose +Audio File > Copy/Convert File(s)+ in the local Audio Bin menu (or use the +Copy/Convert File(s)+ key command).

If you are using one of the above methods & the pitch is still changing, let me know. Meanwhile, I'm just going to double-check…

Here's the double-check.

You can turn off automatic conversion; perhaps this is what you have done.

An unconverted 48kHz file will be played at the wrong pitch if automatic conversion is switched off. Perhaps you are then not converting it but just copying it. Or perhaps the files are not correctly tagged with the right sample rate information, leading to faulty or no conversion of rate.

The project’s sample rate determines the number of samples Logic Pro uses for audio playback. When you add or record audio files to your project, the sample rate of these files is automatically matched to the project sample rate. Important: The +“Convert audio file sample rate when importing”+ project setting must be active for automatic sample rate matching. You can turn on this setting in the +File > Projects Settings > Assets+ pane.

So — are you saying it's working properly now?

🙂