Theremin multi-mic phase: close + room dual path, stereo width vs mono fold
Close spots near a theremin body or amp feel lush and continuous in the booth and in cans. On phone speakers or YouTube mono fold, pitch attack, Mid fundamental, and vibrato bloom often thin or cancel against room/OH and stereo FX returns that carry the same phrase a few milliseconds later. DI or line outs stacked with a mic'd amp add a classic dual-path fight. That is usually polarity and arrival time between close and shared beds, plus a stereo wet bed that was never folded before send. Fix polarity and small delays first. Frequency-aware phase repair belongs only after residual L/R fights remain on stereo beds before mono fold. Distinct from modular Eurorack multi-out pages and synth-layer unison pages: this page is about a single continuous air-instrument melody (classical etherwave-style, modern solid-state, continuum/ribbon cousins treated as continuous Mid) with close+room dual path and stereo width vs mono fold. Cross-links: modular, synth layers, woodwind, chorus/mod, field, livestream.
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PHIXER is free stereo phase-repair (VST3/CLAP/AU · Win/Mac/Linux) from Riverflux Audio. Frequency-aware phase rotation for leftover L/R fights on stereo material. It is not a compressor, not a widener, and not a substitute for mic placement or mono audition of the stream or mix bus. Polarity and timing first; PHIXER after residual spectral fights.
What theremin close+room phase failure sounds like
- Pitch articulation huge in cans, thin on phones. Close and room share the same phrase a few ms apart from stereo OH or FX returns.
- Fundamental and vibrato hollow on YouTube. Spot + stereo wet bed + room stack cancels Mid when the platform folds.
- DI + amp dual path present in booth, gone on phone. Hard L/R across close and amp paths collapse on mono fold.
- Theremin hero vs modular / synth companion bed fight. Eurorack and soft-synth pads share mid energy without polarity hygiene.
- Fine in headphones, broken for livestream viewers. Same destinations as YouTube / social mono, OBS livestream, modular Eurorack, synth layers.
Fast mono audition (about 60 seconds)
- Solo the stream / mix bus (not only booth headphones). Flip a utility to mono.
- A/B theremin close muted vs open under room/OH and wet FX. Note what disappears: pitch onset, Mid, vibrato body, amp bloom.
- Solo pairs: close vs DI, amp vs room, theremin vs modular/synth bed, dry vs wet return.
- Check correlation on the delivery bus, then with the full electronic bed muted vs open.
Order of operations (before spectral phase rotation)
1. Polarity between close / DI / amp and shared room / OH / FX
Flip close or DI vs room, or amp vs close, when body or Mid return immediately on a clear pitch onset. Guide: polarity vs phase. Cousins: modular Eurorack, synth layers, bass DI + amp.
2. Small delay align secondary paths to the hero theremin image
Room, OH, and amp secondary often arrive later than close or DI. A few samples of delay on the secondary often restores body better than EQ for "more air" or "more sci-fi."
3. One hero theremin image to the stream or mix bus
Do not send every close, DI, amp, room, OH, and wet return all hot into the livestream or print. Pick a hero Mid-safe bed (often close or DI plus selective room), keep extras muted or low. Parallel stacks are classic thin-theremin on phone fold. Related: overhead & room.
4. Prefer hero pitch path as the tone; quieter color and wet beds
Secondary room and stereo FX should color air and space, not replace the hero image for the stream mix. If every wet return sits at full level under a loud OH, mono fold almost always hollows the continuous Mid.
5. Skip wideners and Haas on theremin beds before fold
Short-delay width and stereo imagers make booth headphones shimmer and phones hollow. Keep critical low-mid and pitch fundamental centered for stream and print. Related: chorus / mod vs mono, Haas vs phase.
6. Only then audition residual L/R spectral fights
If a stereo bed must stay stereo and fold still hollows a band after the steps above, gentle frequency-aware phase rotation can help. Prove it with mono A/B, rotator bypassed vs engaged.
Path types and typical failure modes
| Path | Common mono failure | First fix |
|---|---|---|
| Close + room / stereo OH | Body / Mid cancel on stream | Polarity; delay secondary; quieter secondary |
| DI + mic'd amp dual path | Hollow fundamental, thin vibrato | Polarity + timing; hero Mid-safe path |
| Theremin + modular / synth bed | Hero vs companion fight on phone | Polarity + delay; hero image |
| Stereo FX / chorus / ping-pong wet | Huge in cans, thin on phone | Mono-check returns; simplify width |
| Board / matrix → OBS / YouTube | Fine in booth, hollow for viewers | OBS livestream / YouTube mono |
Studio / livestream checklist (to send)
1. Label close vs DI vs amp vs room vs OH vs FX vs companion bed
Name paths so operators know what hits the livestream or print. Ambiguous stacks get left open and comb on fold.
2. Mono-check delivery bus alone, then with full electronic bed
Solo pitch onset and Mid in mono. Then open wet FX and modular companions in mono. Note fights between secondary color and hero bed.
3. Watch phone, YouTube, and social destinations
Most remote viewers hear mono or near-mono. Guides: YouTube / social mono, OBS livestream, TikTok / Reels / Shorts.
4. Re-check after stand / antenna / amp moves
Antenna proximity, amp position, and room mic height change distance and bleed. Flip polarity again after you move stands, change OH height, or re-patch DI.
When PHIXER helps
- The material is already stereo and must stay stereo (stereo OH, stereo room or FX print), not a mono close you fake-widened.
- Polarity, delay align, and hero-path levels are cleaned up, but fold still hollows a band of the spectrum.
- You can A/B mono with the plugin bypassed and hear clearer body or pitch attack without wrecking the image.
- You are not using it to "fix" unaligned close+room under wet FX, or to replace a time-align edit on the matrix.
Decision table
| You notice… | First try | Why |
|---|---|---|
| Body thins when room opens under close | Polarity; delay secondary; quieter secondary | Arrival-time fight |
| DI + amp harsh and hollow | Polarity; timing; hero Mid-safe path | Dual-path close + amp |
| Fine in booth, thin on phone | Mono delivery bus; pull extras | Booth ≠ viewer fold |
| Stereo wet bed still cancels by band | PHIXER on that stereo bed | Residual spectral L/R fight |
| Mono theremin alone is dull | Tone / EQ / gain / mic or DI choice | Not an L/R repair job |
When NOT to use PHIXER here
- You have not mono-auditioned the stream / mix bus yet.
- The fix is obviously polarity, delay, one hero image, quieter FX, or quieter secondary under close/room.
- You want PHIXER to make the theremin louder, wider, or "more sci-fi." Wrong job.
- The path is mono and the print problem is balance or EQ.
- See also when not to use PHIXER.
Quick path: Solo delivery bus in mono → polarity close/DI/amp vs room → delay-align secondary → one hero theremin image → quieter FX and extras under hero → skip Haas/imagers → mono-check with full synth bed → PHIXER only for leftover stereo cancellation on a stereo bed → fold again for stream / studio print.
Related guides
- Modular / Eurorack multi-out stereo mono-fold (distinct: multi-out modules vs single theremin close+room)
- Synth layers / unison phase (distinct: stacked unison layers vs continuous air-instrument dual path)
- Woodwind / sax section multi-mic phase
- Chorus / flanger / phaser vs mono
- Stereo reverb returns mono fold
- Field recording / dual recorder outdoor phase
- Polarity vs phase rotation
- When not to use PHIXER
- YouTube / social mono fold checklist
- Twitch / OBS livestream mono fold
Watch
- PHIXER tutorial + how it sounds (walkthrough with audio examples)