SEARCH

How-To Geek

How To Change the Pitch and Tempo of an Audio Track Independently

banner

When you’re putting audio tracks together, you’ll often notice that there are discrepancies between them. Using Audacity, you can easily change the tempo of a song independently of the pitch, or vice-versa, to better suit your project.

Changing Tempo

You can change the tempo of your track without it sounding like chittering chipmunks. Select your track (or a portion you want to edit) and go to Effect > Change Tempo…

tempo

You can enter a percent change, or enter the original and target beats-per-minute values. You can also optionally change the tempo so that it fits a specific length. This will lengthen or shorten your track accordingly, so you may have to rearrange tracks to make things line up properly if you’ve got a multi-track project in front of you. This comes in handy when you need to stretch out a vocal track to fit over some an instrumental part.

Changing Pitch

To change the pitch or key of a track, go to Effect > Change Pitch…

pitch

You can change the key via percent, frequency, the number of half-steps, or enter the original and target keys using the letter notes. This works really well for stringed instruments, like raising or lowering the key of guitar solo so you can play along in a different tuning.

Changing Both Simultaneously

Most people don’t want to change both at the same time, but it comes in handy when converting between Vinyl RPM formats. Go to Effect > Change Speed…

both

You can change between 33 1/3, 45, and 78 RPM formats or do a percentage change.


In general, you want to make small changes to your tracks so that they fit better. At larger changes, past 25%, you’ll hear noticeable artifacts pop up. This is especially true for vocals, and you can get away with a lot with some instruments. Used with high quality source audio, these changes can provide some really interesting effects, like making sci-fi noises and weird background rumbling.

Yatri Trivedi is a monk-like geek. When he's not overdosing on meditation and geek news of all kinds, he's hacking and tweaking something, often while mumbling in 4 or 5 other languages.

  • Published 04/15/11

Comments (1)

  1. Dave

    Anyone who has ever taken a CPR course has probably learned that two songs approximate the correct tempo (100 per minute) for chest compressions: Stayin’ Alive (Bee Gees) and Another One Bites the Dust (Queen). You can take your pick, depending on the situation. In a real situation it might be best not to hum the latter aloud if family members are looking on anxiously, however.

    I found that their tempos were not exactly correct, however. So I loaded them up in Audacity, and using the the Change Tempo function described, modified them so that they were exactly 100 beats per minute! I’m prepared for the next CPR class now!

    I guess I had too much spare time that day!

Enter Your Email Here to Get Access for Free:

Go check your email!