AuxSpacer
Dynamic Spectral Frequency Carver & Resonance Tamer
Real-time 32-band Short-Time Fourier Transform (STFT) spectral carver. Instead of indiscriminately ducking the entire volume of your tracks, AuxSpacer acts like an automated laser scalpel—dynamically carving micro-notches only at colliding frequencies when a sidechain signal hits. Unlock pristine lead clarity, heavyweight 808s, and 4–6 dB of headroom without audible pumping.
The Problem With Traditional Mixing Tools
When two instruments clash in a mix, producers have historically relied on static notch EQ or broadband sidechain compression. Both are blunt compromises that damage the tone and vitality of your production. AuxSpacer replaces both with intelligent, millisecond-accurate Fourier transform carving.
Cuts Frequencies When They Don't Need Cutting
Notching out 2.5 kHz on your synth bus gives the vocal room during the chorus. But when the vocalist stops singing, that notch remains permanently frozen—leaving your synths thin, hollow, and lifeless throughout the entire verse.
- Permanently guts tone and musical body
- Requires endless automation curves to fix
- Deadens acoustic resonance across arrangement
Pumps The Whole Track Indiscriminately
Standard duckers drag down the entire volume of your instrument bus every time the trigger hits. While this creates space, it introduces audible volume breathing, wipes out groove dynamics, and saps the punch from your drums and rhythm.
- Audible volume pumping and breathing
- Clashing frequencies still fight when opened
- Sacrifices wall-of-sound energy for clarity
Dynamic Micro-Notches Only Where Clashes Occur
AuxSpacer splits incoming audio across 32 Fourier transform bands. It dynamically dips strictly the colliding harmonics in real time only for the duration of the incoming syllable or drum transient. When the trigger stops, full tone is instantly restored.
- Zero volume pumping: 100% transparent energy
- Mid/Side separation: Clean center, wide stereo
- Instant setup: Drop on bus, link trigger, set Space
Watch AuxSpacer in Action
Live Ableton demonstration of real-time spectral carving, sidechain unmasking, and M/S control by Austin Ross.
Hear AuxSpacer in Action
Toggle seamlessly between raw mix, carved track, and isolated delta harmonics in real time without audio interruption.
Where AuxSpacer Excels
Purpose-built for transparent dynamics and surgical frequency pocketing across your entire production chain.
Kick vs 808 Sub-Bass Separation
Traditional ducking guts the sub-bass every time the kick hits. AuxSpacer carves out only the punch frequency (e.g. 50–90 Hz) for a split second, allowing the 808 sustained tail to remain massive and uncompromised.
Lead Vocals vs Wall of Guitars & Synths
Route your lead vocal into AuxSpacer on the synth bus. It surgically dips overlapping vowel formants (1 kHz – 4 kHz) on the music whenever words are sung, snapping vocals to the front of the mix instantly.
Harsh Resonance Taming (TAME Mode)
Switch to internal TAME mode to hunt down screechy whistle resonances in vocal recordings, brittle guitar fizz, or abrasive hi-hat buildup without requiring static EQ notch cuts that kill character.
Reverb & Delay Tail De-Crowding
Place AuxSpacer on your vocal reverb and delay return auxes with the dry lead vocal as the sidechain. Whenever the singer is active, the reverb wash dips in the intelligibility zone, blooming back up the millisecond the vocal rests.
32-Band Dynamic Filtering Without Latency Bloat
Traditional dynamic EQs use CPU-heavy recursive biquad filters that introduce phase smear and buffer delays. AuxSpacer uses a zero-allocation 32-band Short-Time Fourier Transform (STFT) architecture designed to run on hundreds of tracks simultaneously without breaking a sweat.
Dial It In
3 Primary Knobs • Instant Results in SecondsThe master carving and taming depth. Controls how aggressively AuxSpacer attenuates clashing frequencies in CARVE mode or resonant peaks in TAME mode. 25–45% creates instant transparent vocal pockets.
Adjusts filter sharpness. Low values yield musical, gentle dips; high values narrow into razor-sharp surgical notches that pluck out pinpoint resonant peaks without touching adjacent fundamentals.
Sets the threshold floor for detection. Prevents quiet sidechain bleed, headphone leakage, or background room noise from unintentionally triggering spectral reduction.
Dive Deep
Surgical DSP • Spatial & Ballistic Mastering ControlsCarve space solely in the center (Mid channel) to lock lead vocals to the phantom center, while leaving your reverb and synth stereo spread completely untouched on the wide Sides.
Interactive multi-band detector EQ (High-Pass, Low-Pass, Bell, Notch) with per-band Solo. Click ⚡ LEARN to automatically profile sidechain or host audio and target masking hotspots instantly.
Dial attack from 0.1ms instant transient capture to 100ms smooth bloom. Click Delta at any time to audition strictly the carved or tamed energy being subtracted from your mix.
Complete Knob & Parameter Matrix
| Parameter | Range | Default | Primary Mixing Function |
|---|---|---|---|
| Depth | 0.0% – 100.0% | 50.0% | Master intensity dial; sets maximum dB attenuation across active clashing or resonant bands. |
| Detail (Q Sharpness) | 0.0% – 100.0% | 75.0% | Band selectivity; transitions from broad musical dips to razor-sharp micro-notches. |
| Selectivity (Gate) | 0.0% – 100.0% | 60.0% | Detection gate floor; rejects quiet room ambience, low bleed, or subtle guitar noise. |
| Attack Speed | 0.1 ms – 100.0 ms | 4.0 ms | Speed at which filter notches engage following incoming triggers or resonant spikes. |
| Release Recovery | 1.0 ms – 1000.0 ms | 110.0 ms | Decay envelope recovery time for attenuated filters to return to flat unity gain. |
| Sensitivity EQ & Learn | 20 Hz – 20.0 kHz | Multi-Band | Parametric detector filters (HP, LP, Bell, Notch) with Solo and ⚡ LEARN smart auto-profiling. |
| Dry / Wet Parallel Mix | 0.0% – 100.0% | 100.0% | Blends uncarved dry signal with spectrally carved audio for parallel bus pocketing. |
| Zero Latency Mode | On / Off | On (0 Samples) | Instant zero-buffer monitoring for tracking, low-latency live recording, and real-time mixing. |
“In modern commercial mixing, you shouldn't have to choose between a wall of warm, punchy synths and an intimate, up-front vocal. AuxSpacer was built out of pure necessity in our studio—replacing tedious dynamic EQ setups with real-time Fourier transform spectral pocketing. You drop it on the bus, link the sidechain, and the mix suddenly breathes.”
15 Studio Factory Presets Included
Carefully calibrated starting points crafted across modern commercial pop, hip-hop, electronic, and rock mixes.
Transparent Vocal Pocket
Vocal BusCarves 2.5 dB of 1–4 kHz space across acoustic guitars and synths whenever lead vocals sing.
Trap 808 Carver
Low EndFast 1.5ms attack scoops 55–85 Hz kick punch out of sustained 808 tails without losing sub energy.
Harsh Cymbal Tamer
Internal TameHunts down 5 kHz – 9 kHz crash cymbal build-up on drum overheads, preserving top-end air.
Sidechain Mid Only
Spatial M/SCarves vocal space strictly out of the center channel while leaving wide stereo synth layers untouched.
Snare Reverb De-Crowd
Aux ReturnDips reverb wash at the 200 Hz snare body frequency to keep the snare snap upfront and dry.
Acoustic Guitar Decrowd
AcousticRemoves strummed pick harshness and boominess automatically during dense vocal verses.
Technical Specifications
Built with modern C++20 for seamless cross-platform performance in all major DAWs.
Frequently Asked Questions
How does license activation work?
Upon purchase via LemonSqueezy, you will instantly receive your perpetual license key via email and onscreen receipt. Open AuxSpacer in your DAW, click Activation, paste your key, and you're good to go. The plugin stores authorization locally and never requires an ongoing internet connection.
Can I install AuxSpacer on multiple computers?
Yes! Each license permits activation on up to 3 machines simultaneously (e.g. your studio desktop and your traveling production laptop), regardless of operating system.
How is AuxSpacer different from traditional sidechain compression?
Standard compressors lower the entire volume of a track across all frequencies when triggered, causing audible pumping. AuxSpacer only attenuates the narrow frequency bands where the sidechain trigger currently contains energy, preserving 100% of body and dynamics.
Does AuxSpacer introduce latency?
In Live / Zero Latency mode, AuxSpacer operates with zero samples of delay, making it fully usable during real-time vocal tracking or live instrument recording.
Get AuxSpacer
Test every feature in your actual mixing sessions for 14 days, or purchase a perpetual license with zero subscriptions and free lifetime updates.
Free Evaluation
Experience dynamic spectral carving before spending a dime.
- Full 100% Feature Parity: All 32 STFT bands, Mid/Side modes, and factory presets are active.
- No Credit Card Required: Instant direct evaluation download with zero payment info.
- Zero Audio Interruption: No periodic white noise bursts, silence dropouts, or mix-disrupting beeps.
- Seamless License Unlock: Activate perpetual ownership anytime without reinstalling.
AuxSpacer Pro
Own AuxSpacer forever with instant access and zero recurring fees.
- Instant Perpetual License: Single payment, yours forever with no subscription lock-in.
- 3 Machine Activations: Authorize your primary studio desktop, travel laptop, and secondary workstation.
- 100% Offline Authorization: No iLok USB dongle, third-party bloatware, or online phone-home.
- Free Lifetime Updates: All future v1.x feature refinements and bug fixes are included.