Make SATB practice tracks from a recording you already have.
Choir directors spend evenings at a keyboard recording each part for the section. Cantor does it from a recording of the whole choir: upload it once, and every section gets a track with their own part on it.
How it works for a choir
Upload the rehearsal or concert recording. A few minutes later there are four stems. In Cantor's player, solo the sopranos and export that as the soprano practice track, then do the same for the altos, tenors and basses. Or hand each section the four stems and let them balance their own mix.
Members can also open a shared space for the choir, so one upload serves everyone.
What a section actually gets
Their own part, clearly audible, with the other three quieter behind it. That is usually more useful than a lone part with nothing around it, because singers learn where their line sits in the chord. Each stem is the full length of the recording and stays in time with the original.
What it is not
It is not a synthesiser and it does not invent notes. If a part is barely audible on the recording, it will be barely audible in the stem. And it will not fix a recording with a soloist in front of the choir unless you choose the lead vocal setting.
A real Cantor audio example
This is an actual 30-second separation, not a reconstruction or mock-up. Start with the mixture, then compare each generated voice stem.
Source audio: Cantoría Dataset, licensed CC BY 4.0. Separation by Cantor.
Questions people ask
- Can I export the tracks?
- Yes. Each voice part downloads as its own audio file, and the whole set downloads together.
- Does it work on recordings with piano or organ?
- Yes. Choose the setting for accompanied choir and the instruments are removed before the parts are separated.
- How long does it take?
- Roughly a minute of processing per few minutes of audio, depending on the queue.
Try it on your own recording
Sign in with Google or with a code sent to your email. New accounts start with 15 minutes of audio, no card needed. Open Cantor, or read the full guide to what it does and does not do.