SUMMER
Its color, glue, punch, and balance come from all the parts interacting with the bus processing, sends, shared effects, and master chain. Export those parts one by one, and those interactions change—so the stems no longer add up to the mix everyone approved.
Until now.
SUMMER’s novel stem-reconstruction algorithm rebuilds the stems as a matched set while preserving their original layout. Drop in your final mix and exported stems. Play the SUMMER stems together and they’re identical to your full mix—place them alongside the phase-inverted full mix, and everything cancels to complete silence.
Plus VAT or sales tax where applicable. No email required. The demo processes up to 30 seconds per song, and you can purchase a license at any time. Hear it in action. Patent pending.
Why stems change
Your mix-bus processing hears the whole song. A soloed stem does not trigger it the same way.
That’s why copying the master chain onto every stem still doesn’t recreate the approved mix. The result can be louder, flatter, less glued, or out of balance.
SUMMER starts with the files you already export. It rebuilds them into the same number of stems, preserving your handoff while making their combined playback match the final mix.
Hear it in action
Press play to hear the selected stem set. Then use the large comparison button to hear it against the phase-inverted full mix.
Press play to hear the original stemsPress play to hear the SUMMER stems
The difference remains audibleEverything cancels to digital silence
Use M to mute and S to solo individual stems. Switch between Original stems and SUMMER stems at any time.
This web player uses lossless FLAC files to reduce loading time without changing the audio.
Workflow-agnostic
SUMMER works with stems from any DAW, or even an analog desk. It reads the audio files themselves, so no combination of plugins, bus processing, shared effects or mixer routing is too complex for SUMMER.
Signal processing, not AI. SUMMER rebuilds your existing stems. It does not generate, replace or reinterpret your audio. The same input produces the same result every time.
In Ableton Live, Cubase Pro and REAPER, choose the routing-aware offline export option to render all stems through return, group and master processing. Include the final mix in the same export.
Watch the tutorial
Follow the workflow in Ableton Live, from preparing your stems to processing them in SUMMER and checking the result.
Made to move between rooms
SUMMER is for every handoff where someone needs control without losing the sound that was already approved.
Give music editors room to rebalance, shorten, and adapt a cue without handing over a weaker version of the approved music.
Send mastering stems with genuine control over the record while preserving the finished mix when every stem is played together.
Share beats, bass, music, vocals, and effects with a collaborator—without the combined stem session sounding different from your bounce.
When you receive the final mix and stems from your mixer, SUMMER gives you a set you can rebalance, replace, or build on later—without reopening the mix session or asking the mixer for another pass.
Atmos mixers run their stereo stems and the approved stereo mix through SUMMER before they start the immersive mix. Each SUMMER stem carries its share of the stereo bus processing, so the Atmos mix is built from the sound that was approved—not from dry exports that lost it.
Perform with a complete, flexible stem set that recreates the approved mix when played together. Mute, solo, or rebalance parts onstage without beginning from compromised stem exports.
Archive your SUMMER stems alongside the project. Years later, you can return to a fully playable stem set that still adds up exactly to the approved mix—even if the original session or plug-ins no longer open.
SUMMER for Mac
Make every stem handoff more useful—without asking the next room to compromise on the sound.
Your purchase includes:
Plus VAT or sales tax where applicable.
Purchase SUMMER securely through Polar. Your perpetual license, downloads, receipt, and license key will be available in the Polar Customer Portal.