Recorded file slighltly longer (slower) than original

(Audacity 2.2.2 on MacOS 10.12.6)

I’m using Audacity to convert Vinyl records into MP4.

I found that the recorded copies, when played back, take about 8% longer in time than the original recordings.

Why is this, and how can I fix it?


convert Vinyl records into MP4.

Really MP4? M4A??

You can fix the recorded tracks with Effect > Change Speed. The control panel has many different ways to tell it the correction. One of the ways is enter the desired time and the time you have and it will convert one to the other.

Is the expected time the album time or did you actually time the original? USB turntables are not a gift from heaven. They can have some serious problems and playback speed may be one of them. Does your turntable have a wall power adapter or is it trying to run the platter motor from USB power?

Oddly, you probably do not have dropout or other digital damage. That usually gives you recordings that play too fast.