How do I split a song into stems?

Load the song into PumpyDumpy2AudioMaster and run stem separation. It uses Demucs to rebuild the track as separate stems - vocals, drums, bass, and other instruments - which you can preview and export individually. Everything runs locally on your PC, with no upload and no per-song limit.

A standard four-stem split: vocals, drums, bass, and other (everything else, such as guitars, keys, and synths). You can keep all four, combine some, drop the vocal for an instrumental, or isolate the vocal for an acapella - it is all available from a single separation pass.

Does stem separation upload my song to a server?

No. PumpyDumpy2AudioMaster is a fully offline desktop app. The Demucs model is bundled into the installer, so your song is processed entirely on your machine - no upload, no cloud queue, and no account holding your files. That keeps unreleased or copyrighted material private.

How good is the separation quality?

Demucs is one of the strongest open-source separation models, so results are clean on most modern productions. Very dense mixes or heavy effects can leave faint bleed between stems, which is normal for any separation tool. Because it runs locally, you can re-run as many times as you like to find the best result.

Can I separate any song or only AI tracks?

Any song. PumpyDumpy2AudioMaster works on AI tracks from Suno or Udio, your own recordings, and any audio file you have the right to use. The separation works from the audio itself, so it does not matter how the song was made.

Stem Separation: Split Any Song into Stems, Fully Offline

Q: Is stem separation free?

Yes. PumpyDumpy2AudioMaster is free to download and use, with a light watermark on exported audio. Pro removes the watermark and grants a commercial-use license for $20/month or $200/year, and the same subscription also unlocks PumpyDumpy2Visual.

Break a finished track back into vocals, drums, bass, and other instruments on your own PC - for remixes, mashups, clean-ups, and practice, with no upload and no per-song limit.

A finished song is a single stereo mix, but a lot of creative work needs the parts back: a remix needs the vocal on its own, a clean-up needs to isolate the drums, a cover needs the instrumental. Stem separation rebuilds those parts from the mix, and PumpyDumpy2AudioMaster (PD2AM) does it locally on your PC, so there is no upload and no cap on how many songs you process.

Under the hood it uses Demucs, one of the best open-source source-separation models, to split a track into clean, usable stems you can preview and export individually.

The Four Stems You Get

PD2AM produces a standard four-stem split from a single pass:

Vocals: the lead and backing voice, isolated for acapellas or repair.
Drums: the full kit, ready for re-balancing or replacement.
Bass: the low end on its own for tightening or remixing.
Other: everything else - guitars, keys, synths, and pads.

Keep all four, combine some, drop the vocal for an instrumental, or isolate the vocal for an acapella - one separation covers every use case.

Offline and Private by Design

Because the Demucs model is bundled into the installer, your song never leaves your computer. There is no upload, no cloud queue, and no account that stores your files - which matters when you are working with unreleased material, client tracks, or anything you would rather keep off a third-party server. It is also faster in practice: no upload time, no download wait, and no daily cap.

How Modern Stem Separation Works

Old tricks like centre-channel cancellation only ever produced a hollow karaoke track. Demucs is different: it is a trained model that listens to the audio and reconstructs each instrument as its own track. That is why the stems sound natural and usable rather than smeared. Load a file, run the split, audition each stem, and export the ones you need.

What Producers Use Stems For

Remixes and mashups: drop an acapella over a new instrumental, or rework the original parts.
Clean-ups: isolate and repair a noisy vocal or rebalance a muddy mix.
Sampling: lift a clean drum or bass part to build something new.
Practice and covers: mute the instrument you want to play or sing over.

Beyond Stems: Repair, Master, and Deliver

Stem separation is one tool in a full audio pipeline. Once you have your stems, PD2AM can repair the vocal, build an instrumental or acapella, denoise with DeepFilterNet, master the mix to streaming loudness, and export a delivery pack. It also bridges to its companion app PumpyDumpy2Visual for turning a track into a music video.

Pricing

PumpyDumpy2AudioMaster is free to download and use, with a light watermark on exported audio. Pro removes the watermark and grants a commercial-use license for $20/month or $200/year. The same Pro subscription also unlocks PumpyDumpy2Visual, so you get the audio toolkit and the music-video app for one price. Already a PumpyDumpy2Visual Pro subscriber? Your existing key activates PD2AM too.

Download PD2AM Free for Windows See PumpyDumpy2AudioMaster