Specific to REAPER
- With the “Master mix + stems” option you also get the full mix, handy to compare with the MixingMusic.AI result.
- Use a name like “[project name] $track” so the files stay organized.
- Remove the Master limiter if you have one.
Mix and master your REAPER stems with AI
From REAPER’s File › Render to an AI mix and master. Export your REAPER tracks, upload them to MixingMusic.AI and get an AI mix and master in your browser, with nothing to install. MixingMusic.AI does not replace your DAW: it finishes the song you started in it.
From REAPER to your master in 4 steps
- Step 1
Select the tracks you want to export, open File › Render… and set “Source” to “Stems (selected tracks)”.
Where to export: File › Render › Stems (selected tracks) - Step 2
Set “Bounds” to “Entire project”, choose 24-bit WAV and add the $track wildcard to the file name so each stem carries its track’s name.
- Step 3
Upload the files to MixingMusic.AI (up to 12 stems as WAV, MP3, FLAC, AAC or M4A). The AI proposes a mix by style and by each track’s instrument.
- Step 4
Fine-tune with per-track EQ, the MixBus with LUFS and VU, and AudioChat; then master with AI and compare the original and the master at matched loudness.
Exporting from REAPER
True for any DAW
- Export every stem from the same start point (the project’s 0:00) and with the same length: that keeps them aligned.
- 24-bit WAV is ideal. MixingMusic.AI also accepts MP3, FLAC, AAC and M4A.
- Remove limiters and maximizers from the Master: mastering happens afterwards, in MixingMusic.AI.
- No clipping and with headroom: no stem should reach 0 dBFS.
- The limit is 12 stems: group tracks (drums, backing vocals, layers) if you have more.
What MixingMusic.AI does with your stems
AI mixing
The AI mixes by style and by each track’s instrument; you decide every change.
Learn more →Per-track EQ and MixBus
EQ over the live spectrum, a stereo VU meter and an LUFS meter.
Learn more →AudioChat
An AI chat that analyzes and adjusts a track or the MixBus with your approval.
Learn more →AI mastering
Hear your mix, compare original and master at matched loudness and download 24-bit WAV.
Learn more →Frequently asked questions about REAPER and MixingMusic.AI
How do I export REAPER stems to mix them with AI?
Select the tracks you want to export, open File › Render… and set “Source” to “Stems (selected tracks)”. Set “Bounds” to “Entire project”, choose 24-bit WAV and add the $track wildcard to the file name so each stem carries its track’s name. Then upload the files to MixingMusic.AI, where the AI mixes them and you can master the result.
How do I name the stems automatically in REAPER?
In the Render window, in the file name, type the $track wildcard (for example “song $track”): REAPER adds each track’s name to its file.
Do I need REAPER to use MixingMusic.AI?
No. MixingMusic.AI runs in the browser and takes audio files. REAPER is for producing and recording; MixingMusic.AI is for mixing and mastering with AI what you exported.
How many REAPER stems can I upload?
Up to 12 stems per project, as WAV, MP3, FLAC, AAC or M4A. If you have more tracks, group them in your DAW (drums, backing vocals, layers) and export the groups.
Can I master without uploading stems?
Yes. You can upload the final stereo mix and use AI Mastering, or “Improve mix”. To mix track by track with AI you need the stems.
Is it free to try?
Yes: your first mix, one master and one AI try are free. After that there are one-time plans, no subscription.
REAPER is a trademark of Cockos. MixingMusic.AI is not affiliated with Cockos and Cockos does not endorse this page.
Your next REAPER song, mixed and mastered with AI.
Export your stems and hear the difference today.