Stem Separation in REAPER: Complete Guide

REAPER doesn't have built-in stem separation, but you can integrate AI tools and plugins. Here's how.

REAPER + AI Stem Separation

Two approaches:

1. Pre-process stems with AI → Import to REAPER
2. Use VST plugins inside REAPER

Method 1: Pre-Process with AI (Recommended)

Workflow:

1. Export track from REAPER
2. Process with StemSplit
3. Import separated stems back
4. Continue editing/mixing

Advantages:

• Best quality (latest AI)
• No CPU load during mixing
• Clean stem files

Step-by-Step

1. Export From REAPER:

• File → Render
• WAV format
• Original sample rate

2. Separate Stems:

• Upload to StemSplit
• Select 4-stem separation
• Download vocals, drums, bass, other

3. Import to REAPER:

• Drag stems into project
• Line up with original timing
• Label tracks clearly

4. Mix:

• Individual stem processing
• Effects per stem
• Final master

Method 2: VST Plugins in REAPER

Available plugins:

• iZotope RX Music Rebalance ($399+)
• Acon Digital Extract:Dialogue
• Waves Clarity Vx

Installing VST in REAPER

1. Download VST plugin
2. Place in VST folder
3. REAPER → Preferences → Plugins
4. Rescan VST paths
5. Add plugin to FX chain

Limitations:

• Expensive plugins required
• CPU intensive
• Real-time processing slow
• Lower quality than offline AI

Workflow Comparison

Use Cases in REAPER

Remixing

Process:

1. Separate original track stems
2. Import to REAPER
3. Rearrange, add effects
4. Re-export remix

Karaoke Creation

Process:

1. Remove vocals with StemSplit
2. Import instrumental
3. Add backing vocals
4. Export karaoke track

Sample Extraction

Process:

1. Isolate drums or bass
2. Chop in REAPER
3. Create sample library
4. Use in new productions

Practice Tracks

Process:

1. Remove instrument you're learning
2. Import minus-one track
3. Record yourself
4. Mix together

REAPER Workflow Tips

Organize stems:

• Color code tracks
• Group related stems
• Use folders
• Name clearly

Time alignment:

• Match original BPM
• Use grid snapping
• Adjust timing if needed

Processing:

• EQ individual stems
• Compress where needed
• Add effects creatively

Best Practices

Before separating:

• Use highest quality source
• Normalize levels
• Remove silence

After importing:

• Check phase alignment
• Adjust levels
• Save project frequently

Recommended Setup

For professional results:

1. Stem separation: StemSplit (best quality)
2. DAW: REAPER (editing/mixing)
3. Monitoring: Good headphones
4. Export: WAV 24-bit

FAQ

Can REAPER separate stems natively?

No. Use external AI tools like StemSplit then import results.

Do I need expensive plugins?

No. Pre-process with StemSplit ($0.10/min) instead of buying $399+ plugins.

What sample rate should I use?

Match your project sample rate (usually 44.1kHz or 48kHz).

Conclusion

Best workflow for REAPER users:

1. Export track from REAPER
2. Separate stems with StemSplit
3. Import separated tracks
4. Mix in REAPER

Faster, cheaper, and better quality than VST plugins.

Try StemSplit + REAPER Workflow →