Add Slowed, Reverb & Nightcore to Part of a Song
Select a part of your song, and the tool repeats it with each effect one after another — Slowed + Reverb, 8D, Nightcore, Bass Boost, and more — in one audio file. You can also apply all effects together on the part.
How to add effects to part of a song
1
Upload and select
Upload your song, then drag on the waveform to select the part you want to change. Use Play selection to check it.
2
Pick the effects and order
Keep One effect after another selected, tick the effects you want, and use the arrows to set the order — for example Slowed + Reverb first, then 8D, then Nightcore.
3
Render and download
Choose the full song or only the edited part, press Render, listen to the result, and download the MP3.
What is the Part Effects Editor?
The Part Effects Editor takes one section of a song and repeats it with each effect one after another — Slowed + Reverb, then 8D, then Nightcore, Bass Boost, Vaporwave, and more — in a single audio file. It is perfect for comparing effects, making a fun effects mix for TikTok or Reels, or finding the best version of a chorus. You can also stack all effects together on the part while the rest of the song plays normally.
What you can do
Select any part
Drag on the waveform or type exact start and end times to choose the part to change.
Every effect, one after another
The selected part repeats with each effect in your order, so you can compare them or share one fun mix.
Keep the rest untouched
The rest of the song keeps its original sound, and the edited part fades in and out smoothly.
Download only the part
Export just the edited part with a natural reverb tail for TikTok, Reels, Shorts, or ringtones.
Instant speed preview
Hear the slowed or nightcore tempo of the selected part in your browser before you render.
High-quality MP3
The result is a 320 kbps stereo MP3 at 48 kHz, ready to share or edit.
Why use the MP3Extra Part Effects Editor?
- Free, with no account and no app
- The same part with every effect, in one audio
- Full song or only the edited part
- Works with audio and video files up to 80 MB
- Works on phones, tablets, and computers
Part Effects Editor FAQ
Can I add slowed and reverb to only one part of a song?
Yes. Select the part on the waveform, choose Slowed + Reverb or set your own values, and render. Only that part changes.
Can the part repeat with each effect separately?
Yes. Choose One effect after another. The part plays once with each checked effect, in the order you set, all in one MP3. Choose Full song or Only the edited part to stack all effects together instead.
Does the rest of the song stay the same?
Yes. In Full song mode the rest of the track keeps its original sound, and Smooth transitions blend the edges.
Can I download only the edited part?
Yes. Choose Only the edited part to download just that section with the effects and a smooth reverb tail.
Why is the edited part longer or shorter?
Slowing down makes the part longer, and speeding up (nightcore) makes it shorter. The pitch changes with the speed, like classic slowed and nightcore edits.
Which files can I use?
MP3, WAV, M4A, AAC, OGG, OPUS, FLAC, and the sound from video files such as MP4, MOV, and WEBM, up to 80 MB.
How do I choose exact times?
Type the start and end in minutes and seconds, or play the song and press Set start here and Set end here at the right moments.
Is it free?
Yes. The Part Effects Editor is free to use with no account.